general Maths Puzzle

Two trains leaves from the same place in the same direction. One traveling with the speed of 60 Km/hr and the other 40 Km/hr.After how many hours will the train be 150 Km apart?

Read Solution (Total 3)

7.5 hrs

Relative speed = 60-40= 20 km/hr
time taken for diff of 150 kms = 150/20 = 7.5 hrs
12 years agoHelpfull: Yes(4) No(1)

AFTER 7.5 HRS
150/(60-40)=7.5
12 years agoHelpfull: Yes(2) No(2)
at each hour train b is lagging behind by 20 km.at the end of 7th hr it will be 140 km and it will take half an hr more to lag behind by 10 km more
hence 7.5 hrs
12 years agoHelpfull: Yes(0) No(0)

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