Question

Keep an eye two trains a and b start simultaneously from stations x and y towards each other respectively. After meeting at a



point between x and y,train a reaches station y in 9 hours and train b reaches station x in 4 hours from the



time they have met each other. If the speed of traina is 36 km/hr, what is the speed of train b?



a)24 km/hr b)54 km/hr c)81 km/hr d)16 km/hr

Answer 1

Ans is 54kmph

First find out how much time it took for both train to reach meeting point
Which is Geometric mean of. Time taken by each train reach destination after merting point

So time taken to reach meet point
= root (9*4) = 6
So time taken by train a is 6+9 or 15 hours
Time by b is 4+6 or 10 hours
Speed is inversely prop to time
Time is in ratio 3:2. So speed is 2:3
A speed 36 thus b speed should b 54