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Arithmetic Ability
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Q.
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
View Answer
Correct choice: A
Explanation:
Let the original speed be x km/h, then 600/x−600/(x+20)=1 ⇒600(x+20−x/x(x+20))=1 ⇒x2+120x−12000=0 ⇒(x−120)(x−100)=0 Therefore, original speed = 100km/h
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