A person takes a trip, driving with a constant speed of 89.5km/h, except for a 22.0−min rest stop. If the person's average speed is 77.8km/h
, how much time is spent on the trip and how far does the person travel?
Average Speed:

Let a body covered d1,d2,d3
distances in respective time intervals t1,t2 and t3.

.

Then the average speed of the body is given by

Average Speed=Total DistanceTotal Time=d1+d2+d3t1+t2+t3.