Trains 210 m and 190 m long run on parallel lines. Moving in opposite directions they cross in 10 s; moving the same way the faster clears the slower in 40 s. What is the slower train's speed?

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Accepted Answer

54 km/h. Total 400 m. Sum of speeds =400/10=40 m/s; difference =400/40=10 m/s. Slower =40-10/2=15 m/s =54 km/h. (90 km/h is the faster train.)

Trains 210 m and 190 m long run on parallel lines. Moving in opposite directions they cross in 10 s; moving the same way the faster clears the slower in 40 s. What is the slower train's speed?

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