Question

A train started with a speed of 30 kmph. After 3 hours second train of same length starts from the same place and goes with a speed 60 kmph. How much time will the second train take

Answer 1

After 3 hours first train would have traveled 90 miles.

In the next hour the first train reaches 120 miles and the second one reaches 60 miles.

In the next hour the first train reaches 150 miles and the second one reaches 120 miles.

Now in the next hour both reaches 180 miles.

So after 3 hours the second train over takes the first train.