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Question

What is the length of the bridge which a man riding 15 km an hour can cross in 5 minutes?


A
850 m
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B
1050 m
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C
1250 m
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D
Can't be determined
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Solution

The correct option is C $$1250$$ m
$$\Rightarrow$$  Speed of man $$=15\,km/hr$$

$$\Rightarrow$$  Time needed $$=5\,min=\dfrac{5}{60}hr$$

$$\Rightarrow$$  $$Distance =Speed\times Time$$
                         $$=15\times\dfrac{5}{60}$$

                         $$=1.25\,km$$

$$\Rightarrow$$  Distance $$=1.25\,km=(1.25\times 1000)m=1250\,m$$

$$\therefore$$  The length of the bridge is $$1250\,m$$

Mathematics

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