Q4. A car traveling at an average speed of 72 km/hr takes 9 minutes to travel a certain distance. By how much should it increase its speed (in km/hr) to travel the same distance in 8 minutes?
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Answer:
= 1st speed=distance/time
=72km/hr=distance/9min.
=distance=72km/hr × 9/60hr
=distance=10.8 km
Now, to travel the same distance in 8 minutes, we have
2nd speed=distance/time
= 2nd speed = 10.8km/8min
=2nd speed= (10.8 km×60)/8 hours
=2nd speed= 81km/hr
Thus,the car should increase its speed by : 2nd speed - 1st speed
= 81km/hr - 72km/hr
= 9km/hr
Correct me if I'm wrong.
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