How long will a car take to travel a distance of 120 kilometres on a road, where the speed limit of the road is 65 km/h for first 100 kilometres and then the speed limit is only 30 km for rest of the distance? The top speed of the car is merely 60 km/h.
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2
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8
Answer:
total km= 120 km
speed limit for first 100km=65 km/hr
speed limit after 100km=30km/hr
speed of the car=60 km/hr
first 100km:
distance÷speed=time
120÷60
2 hours
after 100km:
120-100=20km
distance÷ speed=time
20÷30(bcoz after 100km the speed is automatically 30km/hr)
0.6 hours
total time taken:
2 hr + 0.6 hr
2.6 hours or
0.6 x 60 + 2 x 60
= 156 mins
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