A car can finish a certain journey in 9 hrs. the speed of 72km/h. By how much should its speed be increased so that it may take only 8hto cover the same distance?
Answers
Answered by
3
given
time=9hrs
speed=72km/hr
distance=speed×time
distance=72×9
distance= 648km
second case.
distance=648km
time=8hrs
speed=distance/time
speed=648/8
speed=81km/hr
speed increased=speed of second case-speed of first case
speed increased=(81-72)km/hr
speed increased=9km/hr
time=9hrs
speed=72km/hr
distance=speed×time
distance=72×9
distance= 648km
second case.
distance=648km
time=8hrs
speed=distance/time
speed=648/8
speed=81km/hr
speed increased=speed of second case-speed of first case
speed increased=(81-72)km/hr
speed increased=9km/hr
Similar questions