A car driving in fog passed a man walking at 2 kmph in the same direction. He could see the car for 1 minutes and up to a distance of 300 m. What was the speed of the car?
Explanation:
Man could see the car for 3 minutes and up to a distance of 300 m.
∴ Relative speed of car w.r.t. man = 0.3/(1/60) = 18 kmph.
⇒ Relative speed = 18 = Scar – Sman = Scar – 2
⇒ Scar = 20 kmph.
Hence, option (a).
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