a car travels 10 kilometre distance at a speed of 60 km per hour and returns with a speed of 40 kilometre per hour calculate its average speed for the whole journey
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48 km per hour answer
Case 1
d=10km
s=60km per hour
t=d/t=10/60=1/6
Case 2
d=10km
s=40km per hour
t=d/t=1/40=1/4h
total d =10+10 =20km
total time =1/4+1/6=5/12
avg. speed= total d/total time
therefore answer is 48 km per hour
Case 1
d=10km
s=60km per hour
t=d/t=10/60=1/6
Case 2
d=10km
s=40km per hour
t=d/t=1/40=1/4h
total d =10+10 =20km
total time =1/4+1/6=5/12
avg. speed= total d/total time
therefore answer is 48 km per hour
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