A car runs at the speed of 40 when not serviced and runs at 65 kmph. when serviced. After servicing, the car covers a certain distance in 5 hours. How much $approximate$ time will the car take to cover the same distance when not serviced?
 Answer : Option D Explanation : After sevicing, the distace covered in 5 hours = 65 $\times$ 5 = 325 km Without servicing, speed = 40 km/h Time = $Distance \over speed$ = $325 \over 40$ = 8 hours