A carriage driving in a fog passed a man...

A carriage driving in a fog passed a man who was walking at the rate of 3 km an hour in the same direction. He could see the carriage for 2 minutes and it was visible to him upto a distance of 100m. What was the speed of the carriage ?

2 km/hr

4 km/hr

6 km/hr

8 km/hr

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The correct Answer is:

`D=0.1` km
Relative speed = (x-3) kmph
Time `=(2)/(60) =1/(30)` hour
`(0.1)/(x-3) =1/(30) implies x-3 =3`
x=6

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