Question

wo trains start from stations a and b spaced 50 kms apart at the same time and speed. as the trains start, a bird flies from one train towards the other and on reaching the second train, it flies back to the first train. this is repeated till the trains collide. if the speed of the trains is 25 km/h and that of the bird is 100 km/h. how much did the bird travel till the collision.

Answer 1

time for two trains to collide
$= \frac{50}{25 \times 2} \\ = 1hr$
Now bird flies for this much time
hence distance travelled by bird=100×1
=100km

Answer 2

Answer:

Time for two trains to collide

=25×2/50

=1hr

Now Bird flies for this much time hence travelled by bird =100×1

=100km