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QA – Placement Quizzes | Time Speed Distance | Question 5

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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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Last Updated : 28 Jun, 2021
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