Latest CAT Aptitude Question SOLUTION: If a car travels from A to B at an average speed of 50 km/hour. At what average speed would it have to travel from B to A to average 60 km/hour for the whole trip?

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(#M40009588) CAT Numerical Ability question Keep an EYE

If a car travels from A to B at an average speed of 50 km/hour. At what average speed would it have to travel from B to A to average 60 km/hour for the whole trip?

Asked In CAT Devendra Marghade (12 years ago)

Solved Vignesh Read Solution (3)

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Read Solution (3) :

krishnamurthy  (12 years ago)

75 km/h have to travel from B to A
Speed from A--->B x=50
we find out B--->A.y=? so
The Average speed =2xy/(x+y)=60
2*50*y/50+y=60
100y=3000+60y
40y=3000
so y=75km/hr

Is this solution Helpfull? Yes (5) | No (3)  

Vignesh  (12 years ago)

70km/hour have to travel from B to A.

Travel from A to B, X = 50km/hour.
Travel from B to A, Y = ??

Average Speed :
X+Y /2 = 60km/hour
X + Y = 60km/hour * 2
X + Y = 120km/hour
We already know X= 50km/hour. Apply it.

50km/hour + Y = 120km/hour
Y = 120km/hour - 50km/hour
Y = 70km/hour.

So, Car have to travel 70km/hour from B to A to average 60 km/hour for the whole trip.

Is this solution Helpfull? Yes (4) | No (2)  

Vignesh  (12 years ago)

70km/hour have to travel from B to A.

Travel from A to B, X = 50km/hour.
Travel from B to A, Y = ??

Average Speed :
X + Y /2 = 60
X + Y = 60 * 2
X + Y = 120

We already know X = 50km/hour. Apply it.
50 + Y = 120
Y = 120 - 50
Y = 70km/hour.

So, Car have to travel 70km/hour from B to A to average 60 km/hour for the whole trip.

Is this solution Helpfull? Yes (2) | No (1)  

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