SOLUTION: A train travels at a distances of 100 km and at a speed of 20 km/h. If it had gone two and a half times as fast, how much earlier would it have arrived at B?

Question 935056: A train travels at a distances of 100 km and at a speed of 20 km/h. If it had gone two and a half times as fast, how much earlier would it have arrived at B?

Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
s = d/t
t = d/s
---
original time:
t = 100/20
t = 5 hours
---
at 2.5 times speed:
t = 100/(20*2.5)
t = 2 hours
---
answer:
it would arrive 3 hours earlier
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