A car runs at the speed of 50 kmph when not serviced and runs at 60 kmph, when serviced. After servicing the car covers a certain distance in 6 hours. How much time will the car take to cover the same distance when not serviced ?

 [ A ]    8.2 hours [ B ]    6.5 hours [ C ]    8 hours [ D ]    7.2 hours [ E ]    None of these
 Answer : Option D Explanation :