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 4
minutes and it was visible to him upto a
distance of 100m. What was the speed of the
carriage?
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Answer:
Speed of man = 3 km/hr
Speed in m/sec = (3 x 5/18 F 5/6 m/s
Distance covered by man in 4 min = (5 x 4
x 60)/6 = 200 m
Total distance travelled by the train 100
+200 300 m
Time taken by the train to travel 300 m =
4 min
Speed of the train = 300/240 = 5/4 m/sec
Speed in Km/hr = (5/4 x 18/5) = 4.5 km/h.
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