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A car driver driving in fog, passes a pedestrian

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A car driver driving in fog, passes a pedestrian  [#permalink]

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New post 06 Feb 2019, 03:30
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A
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E

Difficulty:

  15% (low)

Question Stats:

84% (02:10) correct 16% (01:33) wrong based on 37 sessions

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A car driver driving in fog, passes a pedestrian who was walking at the rate of 2km/h in the same direction. The pedestrian could see the car for 6 min and it was visible to him up to a distance of 0.6 km. The speed of the car would be :

A.8 km/h
B.800 m/h
C.200 m/h
D.15 km/h
E. 23 km/h
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Re: A car driver driving in fog, passes a pedestrian  [#permalink]

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New post 06 Feb 2019, 04:38
dharam44 wrote:
A car driver driving in fog, passes a pedestrian who was walking at the rate of 2km/h in the same direction. The pedestrian could see the car for 6 min and it was visible to him up to a distance of 0.6 km. The speed of the car would be :

A.8 km/h
B.800 m/h
C.200 m/h
D.15 km/h
E. 23 km/h


Hi..

Speed is 2km/hr.
If the vehicle speed is x, the relative speed between the two is x-2 km/hr as both are traveling in the same direction.

Now this relative speed should be equal to 0.6km in 6 min or 6km in 60min, that is 6km/h..
Thus (x-2)=6...x=8

A
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Re: A car driver driving in fog, passes a pedestrian  [#permalink]

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New post 06 Feb 2019, 04:41
dharam44 wrote:
A car driver driving in fog, passes a pedestrian who was walking at the rate of 2km/h in the same direction. The pedestrian could see the car for 6 min and it was visible to him up to a distance of 0.6 km. The speed of the car would be :

A.8 km/h
B.800 m/h
C.200 m/h
D.15 km/h
E. 23 km/h


Hello dharam44 ; you sure its 700 level question?
anyways soln below
relative speed in same direction
car speed = x ad man = 2kmph
x-2
distance
0.6 and time 6 mins

we can say
6 = ( x-2) * 6/60
solve for x = 8 KMPH
IMO A
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Re: A car driver driving in fog, passes a pedestrian   [#permalink] 06 Feb 2019, 04:41
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A car driver driving in fog, passes a pedestrian

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