Question

A car runs at a speed of $40$ km/hr when not serviced and runs at $60$ km/hr when serviced. After servicing the car covers a certain distance in $5$ hours. How much time will the car take to cover the same distance when not serviced?

• A. $8$ hours
• B. $7.5$ hours
• C. $6$ hours
• D. $7$ hours

Answer 1

The correct option is B $7.5$ hours

Distance covered by the car in $5$ hours after servicing $=(60\times 5)km=300km$
$\therefore$ Time required to cover the same distance when the car is not serviced $=\frac{300}{40}hrs=7.5hours.$