Question

A submarine traveled to St. Vincent and

back. It took four hours less time to get
there than it did to get back. The average
speed on the trip there was 15 km/h. The
average speed on the way back was 10
km/h. How many hours did the trip there
take?

Answer 1

8 hrs to get there ( 12 hrs to get back)

Explanation:

rate * time = distance distance is the same for both trips

15 km/hr * (t-4) = 10 ( t)

15t - 60 = 10 t

5t = 60

t = 12

t-4 = 8 hrs