Question

a train leaves a station and travels north at a speed of 105mph. two hours later, a second train leaves on a parallel track and travels north at 135mph. how far from the station will they meet

Answer 1

Let the second train catch up after x hours

Distance = speed X time

135x = 105 ( 2 + x)

135x = 210 + 105x

30x = 210

x = 7 hours (after 2nd train has started )
ANSWER 7 X 135 = 945 miles from the starting point

CHECK
7 X 135 = 945 miles

9 X 105 = 945 miles