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SSC GD Constable Speed, Time & Distance Questions with Answers & Explanations

20 Speed, Time & Distance questions from the Elementary Mathematics section of SSC GD Constable, 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 person travels from P to Q at 36 km/h and returns at 45 km/h. What is the average speed for the whole journey?

  1. A37 km/h
  2. B42 km/h
  3. C40.5 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 2

A boat goes 66 km downstream in 3 hours and 48 km upstream in 3 hours. What is the speed of the stream?

  1. A19 km/h
  2. B3 km/h
  3. C4 km/h
  4. D16 km/h
Show answer
Answer: (B) 3 km/h Downstream speed = 22, upstream = 16; stream = (downstream − upstream)/2 = 3 km/h.
Question 3

A speed of 126 km/h is equal to

  1. A453.6 m/s
  2. B40 m/s
  3. C63 m/s
  4. D35 m/s
Show answer
Answer: (D) 35 m/s Multiply by 5/18: 126 × 5/18 = 35 m/s.
Question 4

A train 390 m long is running at 108 km/h. How long will it take to cross a pole?

  1. A11 seconds
  2. B10 seconds
  3. C13 seconds
  4. D9 seconds
Show answer
Answer: (C) 13 seconds Speed = 108 × 5/18 = 30 m/s; time = 390 ÷ 30 = 13 s.
Question 5

A train 180 m long running at 90 km/h crosses a platform in 40 seconds. What is the length of the platform?

  1. A800 m
  2. B850 m
  3. C1000 m
  4. D820 m
Show answer
Answer: (D) 820 m Distance covered = 25 × 40 = 1000 m = train + platform, so platform = 820 m.
Question 6

A speed of 90 km/h is equal to

  1. A30 m/s
  2. B20 m/s
  3. C45 m/s
  4. D25 m/s
Show answer
Answer: (D) 25 m/s Multiply by 5/18: 90 × 5/18 = 25 m/s.
Question 7

A train 285 m long is running at 54 km/h. How long will it take to cross a pole?

  1. A19 seconds
  2. B21 seconds
  3. C15 seconds
  4. D23 seconds
Show answer
Answer: (A) 19 seconds Speed = 54 × 5/18 = 15 m/s; time = 285 ÷ 15 = 19 s.
Question 8

A boat goes 54 km downstream in 3 hours and 36 km upstream in 3 hours. What is the speed of the stream?

  1. A3 km/h
  2. B15 km/h
  3. C12 km/h
  4. D6 km/h
Show answer
Answer: (A) 3 km/h Downstream speed = 18, upstream = 12; stream = (downstream − upstream)/2 = 3 km/h.
Question 9

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. A65 km/h
  2. B57 km/h
  3. C62 km/h
  4. D60 km/h
Show answer
Answer: (D) 60 km/h For equal distances, average speed = 2ab/(a + b) = 60 km/h.
Question 10

A train 110 m long running at 72 km/h crosses a platform in 30 seconds. What is the length of the platform?

  1. A520 m
  2. B470 m
  3. C600 m
  4. D490 m
Show answer
Answer: (D) 490 m Distance covered = 20 × 30 = 600 m = train + platform, so platform = 490 m.

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Question 11

A speed of 36 km/h is equal to

  1. A5 m/s
  2. B10 m/s
  3. C18 m/s
  4. D129.6 m/s
Show answer
Answer: (B) 10 m/s Multiply by 5/18: 36 × 5/18 = 10 m/s.
Question 12

A train 120 m long is running at 36 km/h. How long will it take to cross a pole?

  1. A11 seconds
  2. B12 seconds
  3. C15 seconds
  4. D14 seconds
Show answer
Answer: (B) 12 seconds Speed = 36 × 5/18 = 10 m/s; time = 120 ÷ 10 = 12 s.
Question 13

A boat goes 72 km downstream in 3 hours and 36 km upstream in 3 hours. What is the speed of the stream?

  1. A12 km/h
  2. B7 km/h
  3. C18 km/h
  4. D6 km/h
Show answer
Answer: (D) 6 km/h Downstream speed = 24, upstream = 12; stream = (downstream − upstream)/2 = 6 km/h.
Question 14

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

  1. A45 km/h
  2. B53 km/h
  3. C48 km/h
  4. D50 km/h
Show answer
Answer: (C) 48 km/h For equal distances, average speed = 2ab/(a + b) = 48 km/h.
Question 15

A train 110 m long running at 36 km/h crosses a platform in 28 seconds. What is the length of the platform?

  1. A150 m
  2. B200 m
  3. C280 m
  4. D170 m
Show answer
Answer: (D) 170 m Distance covered = 10 × 28 = 280 m = train + platform, so platform = 170 m.
Question 16

A speed of 180 km/h is equal to

  1. A55 m/s
  2. B45 m/s
  3. C648 m/s
  4. D50 m/s
Show answer
Answer: (D) 50 m/s Multiply by 5/18: 180 × 5/18 = 50 m/s.
Question 17

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

  1. A9 seconds
  2. B16 seconds
  3. C13 seconds
  4. D15 seconds
Show answer
Answer: (C) 13 seconds Speed = 36 × 5/18 = 10 m/s; time = 130 ÷ 10 = 13 s.
Question 18

A boat goes 57 km downstream in 3 hours and 21 km upstream in 3 hours. What is the speed of the stream?

  1. A12 km/h
  2. B6 km/h
  3. C13 km/h
  4. D7 km/h
Show answer
Answer: (B) 6 km/h Downstream speed = 19, upstream = 7; stream = (downstream − upstream)/2 = 6 km/h.
Question 19

A person travels from P to Q at 60 km/h and returns at 90 km/h. What is the average speed for the whole journey?

  1. A75 km/h
  2. B69 km/h
  3. C77 km/h
  4. D72 km/h
Show answer
Answer: (D) 72 km/h For equal distances, average speed = 2ab/(a + b) = 72 km/h.
Question 20

A speed of 90 km/h is equal to

  1. A30 m/s
  2. B25 m/s
  3. C45 m/s
  4. D20 m/s
Show answer
Answer: (B) 25 m/s Multiply by 5/18: 90 × 5/18 = 25 m/s.

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

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