Question

Towns A and B are 400 miles apart. If a train leaves A in the direction of B at 50 miles per

hour, how long will it take before that train meets another train, going from B to A, at a speed
of 30 miles per hour?
(A) 4 hours
(B) 4 hours
(C) 5 hours
(D) 5 hours
(E) 6 hours

Answer 1

Answer: C or D(they appear the same, the answer is 5 hours)

Explanation:

after 5 hours, train a has gone 5*50 miles, or 250 miles

after 5 hours, train b has gone 5*30 miles, or 150 miles

250miles + 150miles = 400 miles