A car travels first 300 kms at an average rate of 80 km/hr and further travels the same distance at an average of 60km/hr. determine the average speed of the car over the whole journey
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Answered by
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You can use formula 2v1v2 / v1 + v2
= 2 × 80 × 60 / 80 + 60
= 2 × 4800/ 140
= 480 / 7
68.57 km/hr
Hope it helps!
= 2 × 80 × 60 / 80 + 60
= 2 × 4800/ 140
= 480 / 7
68.57 km/hr
Hope it helps!
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S1= 80km/hr,D1=300km
T1=D1/S1
T1=300/80
T1=15/4h or225min
S2=60km/h,D2=300
T2=D2/S2
T2=300/60
T2=5h
Total Time=T1+T2
Total time=15/4h+5h
Time=35/4 or8.75h
Total Distance=D1+D2
Distance=300+300
Distance=600
Average speed= total distance/total time
Average speed=600/8.75
Average speed=68.57km/h
T1=D1/S1
T1=300/80
T1=15/4h or225min
S2=60km/h,D2=300
T2=D2/S2
T2=300/60
T2=5h
Total Time=T1+T2
Total time=15/4h+5h
Time=35/4 or8.75h
Total Distance=D1+D2
Distance=300+300
Distance=600
Average speed= total distance/total time
Average speed=600/8.75
Average speed=68.57km/h
is it correct
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