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Question

A car traveling at an average rate of 54 kilometers per hour made a trip in 5 hours. If it had traveled at an average speed of 60 kilometers per hour, how many minutes less would the trip have taken?

A
10
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B
20
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C
30
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D
40
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Solution

The correct option is D 30
Speed of the car =54 km/hr
Time =5 hr
distance travel in 5 hours = 54×5=270 km
If the speed is 60 km\hr then time taken to cover 270 km = distancetime=27060=4.5 hr
difference in both time = 54.5=5hr =30 min

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