A truck crossed a man who was going along road at an average speed of 6 km/hr. The man could see the truck upto 2 minutes and then it disappeared. At the time of disappearance the distance between man and truck was 1.2 km. Find speed of the truck. (a) 30 km/hr (b) 90 km/hr (c) 42 km/hr (d) 48 km/hr
Answers
Given : A truck crossed a man who was going along road at an average speed of 6 km/hr. The man could see the truck upto 2 minutes and then it disappeared. At the time of disappearance the distance between man and truck was 1.2 km
To Find : Speed of Truck
Solution:
Distance traveled by man in 2 minutes = 6 * (2/60) = 0.2 km
Relative Distance between man & truck = 1.2km
Relative Distance between man & truck = Distance traveled by truck - distance traveled by man
=> 1.2 = Distance traveled by truck - 0.2 km
=> Distance traveled by truck = 1.4 km
Speed of truck = 1.4/ (2/60) = 42 km/hr
Speed of truck = 42 km/hr
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