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?

10

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20

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30

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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 $=$ $54 \times 5 = 270$ km
If the speed is $60$ km\hr then time taken to cover $270$ km $=$ $\frac{d i s t a n c e}{t i m e} = \frac{270}{60} = 4.5$ hr
$∴$ difference in both time $=$ $5 - 4.5 = 5$ hr $= 30$ min

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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?

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

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?