saswata4s wrote:

chetan2u wrote:

If Q covers 22 in x, it will cover 3*22 = 66 in 3x..

Can you please explain this part a little more?

Q starts from B and P starts from A and meet 22 kms from B

so when they meet each other, they would have covered a combine of x and B covers 22..

Now when they meet second time..

Q reaches A from B and turns back, so covers x and some distance

In the same time, P covers x distance from A to B and turns back..

Now when they meet they have again covered the distance x..

so TOTAL 3x..

Q covers 22 when they cover x distance, so another 22 when they have covered another x that is x+x

another 22, when they have travelled another x or 3x.. so total 22+22+22=66

Thanks. Its clear now..