Please help...velocity question?

Question

Emily takes a trip, driving with a constant velocity of 85.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 66.8 km/h to the north, how long does the trip take?

Answer 1

The total distance is d, and the time is T
d=85.5*(T-22/60) km
and
d=66.8*T
subtract
0=85.5*(T-22/60) -66.8*T
85.5-66.8*T=85.5*22/60
T=85.5*22/(60*(85.5-66.8)) hours
1.7 hours
or
1 hour 42 min

j