A truck covers a distance of 392 km at a certain speed in 8 hours. How much time would a car take at an average speed which is 18 kmph more than that of the speed of the truck to cover a distance which is 70 km more than that travelled by the truck ?
Select the correct option:
A) 6 hours  B) 5 hours  C) 7 hours  D) 8 hours  E) None
Explanation :   Speed of the truck = Distance/time = 392/8= 
<gadget id="calculator">392/8</gadget>
<output>49</output>
49 kmph   Now, speed of car= (speed of truck + 18) kmph = (48 + 18)= 
<gadget id="calculator">(48 + 18)</gadget>
<output>66</output>
66 kmph   Distance travelled by car= 392 + 70= 
<gadget id="calculator">392 + 70</gadget>
<output>462</output>
462 km   Time taken by car= Distance/Speed = 462/66= 
<gadget id="calculator">462/66</gadget>
<output>7</output>
7 hours.   Answer – 7 hours
<result>C</result>
A truck covers a distance of 392 km at a certain speed in 8 hours. How much time would a car take at an average speed which is 18 kmph more than that of the speed of the truck to cover a distance which is 70 km more than that travelled by the truck ?