On a road trip, a driver achieved an average speed of (48.0+A) km/h for the first 86.0 km and an average speed of (43.0-B) km/h for the remaining 54.0 km. What was her average speed (in km/h) for the entire trip? Round your final answer to three significant figures. A = 15 B = 1

Question

Shaniya Adams

Physics

25 April, 10:38

On a road trip, a driver achieved an average speed of (48.0+A) km/h for the first 86.0 km and an average speed of (43.0-B) km/h for the remaining 54.0 km. What was her average speed (in km/h) for the entire trip? Round your final answer to three significant figures. A = 15 B = 1

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Answers (1)

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Hayden Rollins · Answer 1

A = 15, B = 1

48 + 15 = 63 for the first 86km

43 - 1 = 42 for the remaining 54 km

time = distance/speed

t1 = 86/63 = 1.3651hours

t2 = 54/42 = 1.2857hours

speed = distance/time

s = 140/2.6508

average speed = 52.8km/h