John is supposed to walk from his house to park every morning. One morning, he is in real hurry and wants to save at least 1/3rd of the time. By how much percentage he should increase his speed. - speed

John is supposed to walk from his house to...

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John is supposed to walk from his house to park every morning. One morning, he is in real hurry and wants to save at least 1/3rd of the time. By how much percentage he should increase his speed.

Let the distance between his house and park be 100 metres.

Lets assume he takes 30 mins daily. Hence his speed would be 100/30.

One day, if he wishes to save 1/3rd of 30 minutes, that is 10 minutes, he should cover the distance in 20 minutes in which case his speed would be 100/20.

Required increment in speed = 100/20 - 100/30

Percentage of increase in speed = (Required increment in speed / Original speed) X 100 % = ((100/20 - 100/30) / 100/30 )X100 % = 50%.

a.100%

b.33%

c.66%

d.50%

Asked By : sairabanu Categories : speed, MAT, mathematics, Aptitude, percentage

Answer: d. 50%

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