QA – Placement Quizzes | Time Speed Distance | Question 5

The ratio of the speed of two trains is 7:8. If the second train covers 400 km in 4 h, find out the speed of the first train.
(A) 69.4 km/h
(B) 78.6 km/h
(C) 87.5 km/h
(D) 40.5 km/h


Answer: (C)

Explanation: Let the speed of the two trains be 7x and 8x.
Then, 8x = 400 / 4
⇒ 8x = 100 ⇒ x = 12.5 km/h.
Hence, speed of the first train = 7x = 7 × 12.5 = 87.5 km/h.

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