A motor car starts with the speed of 70km/hr with its speed increasing every two hours by 10kmph. In how many hours will it cover 345 kms  Choose one
A) 4 hrs
B) 5 hrs
C) 6 hrs
D) 4 ½ hrs
E) 5 hrs
Explanation:   4 ½ hrsistance covered in first 2 hours = 70×2 =140km   4 ½ hrsistance covered in next 2 hours = 80×2 =160km   Remaining distance = 345 -140-160= 
<gadget id="calculator">345 -140-160</gadget>
<output>45</output>
45km   Speed of the fifth hour=90km/hr   Time taken to cover 45km = 45/90 = ½ hr   Total time taken = 2+2+ ½ = 4 ½ hrs   Answer: Option 4 ½ hrs
<result>D</result>
A motor car starts with the speed of 70km/hr with its speed increasing every two hours by 10kmph. In how many hours will it cover 345 kms