Asked by peter
A vehicle travels equal distances at 60km/h and 90km/h.calculate its average speed
Answers
Answered by
collins
formula for average speed=total distance/total time
A=[(60+90)km/h]/no time?
insufficient information
A=[(60+90)km/h]/no time?
insufficient information
Answered by
Reiny
Let the distance for each section be x km
time for the first leg = x/60
time for the 2nd leg = x/90
total time = x/60 + x/90
= (3x+ 2x)/180 = x/36
avg speed = total distance/total time
= 2x/(x/36)
= 2x(36/x)
= 72 km/h
notice it is not the average of the two speeds.
time for the first leg = x/60
time for the 2nd leg = x/90
total time = x/60 + x/90
= (3x+ 2x)/180 = x/36
avg speed = total distance/total time
= 2x/(x/36)
= 2x(36/x)
= 72 km/h
notice it is not the average of the two speeds.
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