Distance and travel average speed

Anonymous
timer Asked: Sep 11th, 2014
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Question Description

During the first 18 minutes of a 1.0-h trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip if the car is to have an average speed of 21 m/s for the entire trip?

Tutor Answer

khakaan
School: UC Berkeley

distance travelled in 18 min is= 11880m 
total distance =75600m 
remaining distance= 75600-11880 
= 63720m 
time = 42 min = 2520 sec 
speed = 63720/2520 = 25.28m/sec

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