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

Question

Physics

Johanna Fitzgerald

27 April, 01:24

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

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Answers (1)

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Kyra · Answer 1

(a) : It spends on the trip 2.75 hr (2 hours 45 minutes)

(b) : The person travels 213.9 km.

Explanation:

Vp = 77.8 km/h

V1 = 89.5 km/h

V2 = 0 km/h

t2 = 0.36hr

t1=?

Vp = (V1*t1 + V2*t2) / (t1 + t2)

clearing t1:

t1 = 2.39 hr

Trip time = t1+t2

Trip time = 2.75 hr (a)

Distance traveled = V1*t1

Distace traveled = 213.9 km (b)