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Two trains have lengths of 300 m and 200 m. when they run in the same direction, the faster train will take 100 seconds to cross the slower train. When they run in the opposite directions they will take 20 seconds to cross each other. Find the speeds of the trains.

A.	10, 13	B.	13, 10
C.	15, 10	D.	15, 15

Answer and Explanation

Answer:15, 10

Explanation:
let the speeds of the trains be x m/sec and y m/sec where x>y
=> 300 + 200 / x – y = 100
=> 5 = x - y => (1)
=> 300 + 200 / x + y = 20
=> 25 = x + y =>(2)
=> x = 15 and y = 10

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