one car moving on a straight road covers one - third of the distance with 20 km/hr and the rest with 60 km/hr. the average speed is ?
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Let the total distance to be covered be 3x km.
FOR FIRST ONE-THIRD DISTaNcE:
distance:x km,speed:20 km/hr
time:x/20 s
............
similarly time taken for the rest journey:2x/60 s
Total distance:3x km
Total time taken:x/20+2x/60=x/12s
so avg speed=3x÷x/12=36km/hr
FOR FIRST ONE-THIRD DISTaNcE:
distance:x km,speed:20 km/hr
time:x/20 s
............
similarly time taken for the rest journey:2x/60 s
Total distance:3x km
Total time taken:x/20+2x/60=x/12s
so avg speed=3x÷x/12=36km/hr
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