Walking 3/4 of his normal speed, Rana is 20 minutes late in reaching his office. The usual time taken by him to cover the distance between his home and office-

Questin: Walking 3/4 of his normal speed, Rana is 20 minutes late in reaching his office. The usual time taken by him to cover the distance between his home and office-

Solution:
let, distance y meter and speed x meter/min.
usual time taken y/x min

ATQ,
(y/3x/4) - (y/x) = 20
⇒ (y/x) {(4/3) - 1} = 20
⇒ (y/x) (1/3) = 20
∴ y/x = 60 min