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RRB NTPC Speed, Time & Distance Questions with Answers & Explanations

20 Speed, Time & Distance questions from the Mathematics section of RRB NTPC, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

A train 120 m long running at 90 km/h crosses a platform in 18 seconds. What is the length of the platform?

  1. A330 m
  2. B450 m
  3. C310 m
  4. D360 m
Show answer
Answer: (A) 330 m Distance covered = 25 × 18 = 450 m = train + platform, so platform = 330 m.
Question 2

A train 300 m long is running at 108 km/h. How long will it take to cross a pole?

  1. A8 seconds
  2. B10 seconds
  3. C12 seconds
  4. D7 seconds
Show answer
Answer: (B) 10 seconds Speed = 108 × 5/18 = 30 m/s; time = 300 ÷ 30 = 10 s.
Question 3

A person travels from P to Q at 20 km/h and returns at 30 km/h. What is the average speed for the whole journey?

  1. A29 km/h
  2. B21 km/h
  3. C26 km/h
  4. D24 km/h
Show answer
Answer: (D) 24 km/h For equal distances, average speed = 2ab/(a + b) = 24 km/h.
Question 4

A speed of 144 km/h is equal to

  1. A35 m/s
  2. B518.4 m/s
  3. C40 m/s
  4. D72 m/s
Show answer
Answer: (C) 40 m/s Multiply by 5/18: 144 × 5/18 = 40 m/s.
Question 5

A boat goes 39 km downstream in 3 hours and 21 km upstream in 3 hours. What is the speed of the stream?

  1. A6 km/h
  2. B3 km/h
  3. C7 km/h
  4. D4 km/h
Show answer
Answer: (B) 3 km/h Downstream speed = 13, upstream = 7; stream = (downstream − upstream)/2 = 3 km/h.
Question 6

A boat goes 66 km downstream in 3 hours and 42 km upstream in 3 hours. What is the speed of the stream?

  1. A8 km/h
  2. B14 km/h
  3. C4 km/h
  4. D18 km/h
Show answer
Answer: (C) 4 km/h Downstream speed = 22, upstream = 14; stream = (downstream − upstream)/2 = 4 km/h.
Question 7

A person travels from P to Q at 40 km/h and returns at 60 km/h. What is the average speed for the whole journey?

  1. A48 km/h
  2. B50 km/h
  3. C45 km/h
  4. D53 km/h
Show answer
Answer: (A) 48 km/h For equal distances, average speed = 2ab/(a + b) = 48 km/h.
Question 8

A train 165 m long is running at 54 km/h. How long will it take to cross a pole?

  1. A11 seconds
  2. B9 seconds
  3. C8 seconds
  4. D14 seconds
Show answer
Answer: (A) 11 seconds Speed = 54 × 5/18 = 15 m/s; time = 165 ÷ 15 = 11 s.
Question 9

A speed of 108 km/h is equal to

  1. A30 m/s
  2. B54 m/s
  3. C25 m/s
  4. D388.8 m/s
Show answer
Answer: (A) 30 m/s Multiply by 5/18: 108 × 5/18 = 30 m/s.
Question 10

A train 160 m long running at 54 km/h crosses a platform in 18 seconds. What is the length of the platform?

  1. A140 m
  2. B90 m
  3. C270 m
  4. D110 m
Show answer
Answer: (D) 110 m Distance covered = 15 × 18 = 270 m = train + platform, so platform = 110 m.

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Question 11

A boat goes 36 km downstream in 3 hours and 24 km upstream in 3 hours. What is the speed of the stream?

  1. A10 km/h
  2. B4 km/h
  3. C3 km/h
  4. D2 km/h
Show answer
Answer: (D) 2 km/h Downstream speed = 12, upstream = 8; stream = (downstream − upstream)/2 = 2 km/h.
Question 12

A person travels from P to Q at 45 km/h and returns at 90 km/h. What is the average speed for the whole journey?

  1. A62 km/h
  2. B60 km/h
  3. C65 km/h
  4. D67.5 km/h
Show answer
Answer: (B) 60 km/h For equal distances, average speed = 2ab/(a + b) = 60 km/h.
Question 13

A train 130 m long is running at 36 km/h. How long will it take to cross a pole?

  1. A10 seconds
  2. B13 seconds
  3. C15 seconds
  4. D9 seconds
Show answer
Answer: (B) 13 seconds Speed = 36 × 5/18 = 10 m/s; time = 130 ÷ 10 = 13 s.
Question 14

A speed of 144 km/h is equal to

  1. A40 m/s
  2. B518.4 m/s
  3. C72 m/s
  4. D35 m/s
Show answer
Answer: (A) 40 m/s Multiply by 5/18: 144 × 5/18 = 40 m/s.
Question 15

A train 70 m long running at 72 km/h crosses a platform in 21 seconds. What is the length of the platform?

  1. A330 m
  2. B380 m
  3. C350 m
  4. D420 m
Show answer
Answer: (C) 350 m Distance covered = 20 × 21 = 420 m = train + platform, so platform = 350 m.
Question 16

A boat goes 48 km downstream in 3 hours and 24 km upstream in 3 hours. What is the speed of the stream?

  1. A8 km/h
  2. B4 km/h
  3. C12 km/h
  4. D5 km/h
Show answer
Answer: (B) 4 km/h Downstream speed = 16, upstream = 8; stream = (downstream − upstream)/2 = 4 km/h.
Question 17

A person travels from P to Q at 30 km/h and returns at 60 km/h. What is the average speed for the whole journey?

  1. A37 km/h
  2. B45 km/h
  3. C42 km/h
  4. D40 km/h
Show answer
Answer: (D) 40 km/h For equal distances, average speed = 2ab/(a + b) = 40 km/h.
Question 18

A train 240 m long is running at 54 km/h. How long will it take to cross a pole?

  1. A17 seconds
  2. B16 seconds
  3. C13 seconds
  4. D15 seconds
Show answer
Answer: (B) 16 seconds Speed = 54 × 5/18 = 15 m/s; time = 240 ÷ 15 = 16 s.
Question 19

A speed of 198 km/h is equal to

  1. A55 m/s
  2. B712.8 m/s
  3. C99 m/s
  4. D50 m/s
Show answer
Answer: (A) 55 m/s Multiply by 5/18: 198 × 5/18 = 55 m/s.
Question 20

A train 170 m long running at 72 km/h crosses a platform in 29 seconds. What is the length of the platform?

  1. A580 m
  2. B390 m
  3. C440 m
  4. D410 m
Show answer
Answer: (D) 410 m Distance covered = 20 × 29 = 580 m = train + platform, so platform = 410 m.

These are RankerClub practice questions written in the RRB NTPC pattern. They are not official SSC/IBPS/RRB papers.

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