two boats left the North harbor at 430 Pm One traveled east

two boats left the North harbor at 4:30 Pm. One traveled east at a rate of 45kph,and the other west at 35 kph. How long will it take the boats to be 300 kilometers apart?

Solution

Given,
two boats left the North harbor at 4:30 Pm. One traveled east at a rate of 45kph,and the other west at 35 kph.
Their relative speed = 45+35 = 80kmph
The distance between the boats = 300kms
Time taken = Distance/relative speed
= 300/80
=3 3/4 hours
= 3h 45m