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In a foggy night, the visibility is limited to just 300 mts. Exactly 2 minutes after the driver of a speeding car could see a bus ahead, the driver of the bus sees the car vanishing from his sight, ahead.

If the speed of the bus is 36 kmph, what is the speed of the car?

Initial condition: Car ---------- 300 mts-------------Bus
After exactly 2 minutes: Bus----------300 mts----------Car

Relative distance travelled by car in 2 minutes = 600 mts
Relative speed of car w.r.t bus = .6 km / (2/60) hrs = 18 kmph

Speed of the car = 36 + 18 = 54 kmph

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