a problem on train

[burgess]

Help needed to solve math homework problem

Two trains are moving in opposite directions at 60 kmph and 45 kmph respectively. Their lengths are 1.1 km and 0.8 km respectively. In this problem we need to find out the time taken by slower train to cross the faster train?

How to form an equation for this problem?

Thanks

[Guest]

A & C will move towards each other at a "relative speed to each other" equal to the sum of their actual speeds.

The distance travelled from the fronts of the trains meet until the tails of the trains pass apart is the sum of the lengths of the trains.

Time taken will be (Sum of lengths)/(Sum of speeds).

[Guest]

I should have said......
The two trains will move towards each other at a "relative speed to each other" equal to the sum of their actual speeds.

The distance travelled from the fronts of the trains meet until the tails of the trains pass apart is the sum of the lengths of the trains.

Time taken will be (Sum of lengths)/(Sum of speeds).

[leesajohnson]

Time taken will be (Sum of lengths)/(Sum of speeds)

1.1+ 0.8 = 1.9
60+ 45 = 105

1.9/105 = 0.018