Question
A car moving in the morning fog passes a man walking at 4 km/ h. in the same direction. The man can see the car for 3 minutes and visibility is upto a distance of 130 m. The speed of the car is :
Answer: Option C
Answer: (c)Speed of car = x kmph.Relative speed = (x - 4) kmph.Time = 3 minutes= $3/60$ hour = $1/20$ hourDistance = 130 metre= $130/1000$ km. = $13/100$ km.Relative speed = $\text"Distance"/ \text"Time"$$x - 4 = 13/100$ × 205x - 20 = 135x = 20 + 13 = 33$x = 33/5 = 6{3}/5$ kmph.
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Answer: (c)Speed of car = x kmph.Relative speed = (x - 4) kmph.Time = 3 minutes= $3/60$ hour = $1/20$ hourDistance = 130 metre= $130/1000$ km. = $13/100$ km.Relative speed = $\text"Distance"/ \text"Time"$$x - 4 = 13/100$ × 205x - 20 = 135x = 20 + 13 = 33$x = 33/5 = 6{3}/5$ kmph.
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