Train A has a speed 15 miles per hour greater than that of train B. If train A travels 240 miles in the same times train B travels 180 miles, what are the speeds of the two trains?

Answer 1

since time = distance/speed, If B has speed x, then

240/(x+15) = 180/x
240x = 180(x+15)
4x = 3(x+15)
x = 45

B goes 45, A goes 60

check:

240/60 = 180/45 = 4