4.
(4) Time
A car is moving on a straight road covers one third of the distance with a speed of 20 km/h and the rest with
a speed of 60 km/h. The average speed of the car is
(2) 50 km/h
(4) 55 km/h
5. A car travels half of the distance with constant yelocity an im/h
(1) 40 km/h
(3) 36 km/h
Answers
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6
Answer:
let total distance be 3d
time taken to cover 1/3 distance= d/20
time taken to cover rest of the diatance=2d/60=d/30
total(average) speed=total distance cover/total time taken
=3d/(d/20)+(d/30)
=(3d x 60 )/(3d+2d)
=(3 x 60)/5
=3 x 12= 36
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