Question

A father and a son are preparing for a jog on the beach. They both leave from the same lifeguard station and begin running in opposite

directions. The son runs at a speed of 8.1 mph, and the father at 6.3 mph.
How many hours will have elapsed when the father and his son are 20.16 miles apart?​

Answer 1

1.4 hours have elapsed when the father and his son are 20.16 miles apart

Explanation:

The son runs at a speed of 8.1 mph.

The father runs at a speed of 6.3 mph.

They run in opposite directions, so per hour, their distance increases at the rate of 8.1 + 6.3 = 14.4 mph.

How many hours will have elapsed when the father and his son are 20.16 miles apart?​

Rule of 3.

1 h - 14.4 miles

x h - 20.16 miles

`14.4x = 20.16`

`x = (20.16)/(14.4)`

`x = 1.4`

1.4 hours have elapsed when the father and his son are 20.16 miles apart