5. Trains A and B left stations R and S simultaneously on two separate parallel rail tracks that

are 350 miles long. The trains pass each other at point X after traveling for a certain amount

of time. How many miles of the rail tracks has train A traveled when the two trains passed

each other?

(a) Up to point X, the average speed of train B was 25% less than the average speed of train

A.

(b) Up to point X, the average speed of train B was 60 mph and it took two and a half hours

for train B to arrive at point X.