Question

Points a and b are separated by 50 miles on a straight road. Cyclist a leaves point a, heading toward point b, at a constant speed of 15 miles per hour. At the same time, cyclist b leaves point b, traveling toward point a, at a constant speed of 10 miles per hour. After how many minutes have elapsed will the two meet?

Answer 1

Let cyclist b to be at rest. So cyclist a has speed 25 miles/ hr wrt b .
Time taken to meet= 50/ 25= 2 hr= 120 min.

Answer 2

Answer:

Points a and b are separated by 50 miles on a straight road. Cyclist a leaves point a, heading toward point b, at a constant speed of 15 miles per hour. At the same time, cyclist b leaves point b, traveling toward point a, at a constant speed of 10 miles per hour. After how many minutes have elapsed will the two meet?