Question

A train leaves the station and travels north at a speed of 75 mph. Two hours later, a second train leaves on a parallel track and travels north at 125 mph. How far from the station will they meet?

Answer 1

Key concept:
they will have travelled the same distance
time taken by the slower train ---- t hours
time taken by the faster train ----- t-2 hrs

125(t-2) = 75t

solve for t , sub into either 75t or 125(t-2)

Answer 2

75*2 + 75t = 125t,
t = 3h.
d = 125 * 3 = 375 Miles.