A car moves at a constant speed of 60km/hr for 1km and 40 km/hr for next 1km. What is average speed of the car?
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avg. speed= total distance/ total time
time for 1km=1/60 hr
time for next 1km= 1/40 hr
so,total time=1/60 +1/40=2+3/120=5/120=1/24 hr
so, total distance=1+1=2 km
so, avg. speed =2/(1/24)=48km/hr
Thanks
time for 1km=1/60 hr
time for next 1km= 1/40 hr
so,total time=1/60 +1/40=2+3/120=5/120=1/24 hr
so, total distance=1+1=2 km
so, avg. speed =2/(1/24)=48km/hr
Thanks
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