Question 98

The speed ( in kmph) of a person who crosses a 1200 meter long bridge in 12 minutes is

Solution
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Speed of the person = $$\frac{1200}{12}=100\ \frac{meters}{\min}$$

Multiplying both numerator and denominator by 60 (because we want speed in kmph), 
We get Speed = $$6000\ \frac{meters}{hour}=6\ kmph$$

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