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Can someone explain why this answer is right? Dilpreet drives a distance of 120 miles in 2 hours. She stops for 1 hour to eat lunch and rest. Then she drives another 150 miles in 3 hours. ANSWER: 54 (why is it not 55?)

Can someone explain why this answer is right Dilpreet drives a distance of 120 miles in 2 hours She stops for 1 hour to eat lunch and rest Then she drives anoth class=

Respuesta :

MathPhys

Step-by-step explanation:

Average speed = distance / time

Total distance traveled = 120 mi + 150 mi = 270 mi

Total time = 2 hr + 1 hr + 3 hr = 6 hr

Speed = 270 mi / 6 hr = 45 mph

If we ignore the time she was stopped, then her average moving speed is:

Speed = 270 mi / 5 hr = 54 mph

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