Question

A car moves at a constant speed of 60 km/hr for 1km and 40 Km/hr for next 1km . what is the average speed of the car

Answer 1

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