i have a problem really bugging me

2 cars from different towns town A and town B travel in opposite directions from 1 town to another. they meet at town C.the car from A completed thejourney from C to B in 45 minutes at a steady rate of 64/kms an hour. The other car completes the journey from C to A in 20 minutes. how fast was the car from B going?

i know that the car from B goes from B to C in the same time as the car from A goes from A to C.

please show how i can do this problem, and please don't say "guess and check"

thanks