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Question

Mohan is driving a car. He takes 12 minutes to cross a bridge while travelling uniformly at a speed of 40km/hr. How long is the bridge?



A

8 km

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B

10 km

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C

12 km

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D

None of these

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Solution

The correct option is D

8 km


Time taken to cross the bridge = 12 minutes

60 minutes = 1 hour

1 minute = 160 hr

12 min = 12 × 160=1260 hrs = 15 hrs

Therefore, the time taken to cross the bridge = 12 minutes = 15 hrs                   

Speed of the car = 40 km/hr

Distance = Speed × Time = 40 × 15= 405=8 km


Mathematics

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