(12) A bus travelling at 42 km/h covers a distance in 5 h. How mu
increased its speed by 8 km/h?
13. A girl walks 12 km at the speed of 3 km/h. What change should she make in her speed to
take (1) an hour less and (ii) an hour more to cover the distance?
14. A motorcyclist travels at 30 km/h and stops for half an hour at the end of every 75 km. How
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Answer:
speed of bus =43km/h
time taken to cover distance =5h
speed•time =distance
42•5=210km
now speed increased by 8km/h
speed=50
distance=210km
time taken=distance/time
time taken =210/50
time take=4.01hours
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