Question

If Deepesh had walked 20 km/h faster he woulh have saved 1 hour in the distance of 60km. what is the usual speed of Deepesh?

A) 100 B) 120 C) 150 D) None of these

Answer 1

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Answer 2

Answer:

100km/h

Step-by-step explanation:

let 'x' be the usual speed

T1-T2=1hrs

time = distance/speed

The distance is same

[600/x] - [600/(x+20)] = 1

600[1/x - 1/(x+20)]=1

600[(x+20-x)/(x²+20x)] =1

we have to simplify and to get the answer as 100km/h