Trains of length 150 m and 100 m run on parallel tracks. Moving in the same direction, the faster passes the slower in 25 seconds; moving in opposite directions, they cross in 5 seconds. What is the faster train's speed?

Question

Accepted Answer

108 km/h. Sum of speeds = 250/5=50 m/s; difference = 250/25=10 m/s. Faster = 30 m/s = 108 km/h. (72 km/h is the slower one; 180 km/h is the sum.)

Trains of length 150 m and 100 m run on parallel tracks. Moving in the same direction, the faster passes the slower in 25 seconds; moving in opposite directions, they cross in 5 seconds. What is the faster train's speed?

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