velocity physics question. plese help?

Question

Emiy takes a trip, driving with a constant velocity of 89.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 76.8 km/h to the north, how long does the trip take?

Answer 1

The total distance is d, and the time is T
d=89.5*(T-22/60) km
and
d=76.8*T
subtract
0=89.5*(T-22/60) -76.8*T
89.5-76.8*T=89.5*22/60
T=89.5*22/(60*(89.5-76.8)) hours
2.6 hours
or
2 hours 36 min

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