A car travels, first half distance between two places with speed 40 km/h and the rest half in the speed 60km/h, what's the average speed of the car?
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Answer:
let total distance b 2x
time1= x/ speed
time1= x/ 40
same
time2= x/60
total time= x/40 +x/60
=3x/120 +2x/120
=5x/120
=x/24
avg. speed= total distance/ total time
avg. speed= 2x/x/24
=2×24
=48 km/hr
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