A motor starts with the speed of 70 kmph with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms?	Select:	A) 2 1⁄4 hours	B) 4 1⁄2 hours	C) 4 hours 5 minutes	D) Cannot be determined	E) None of these
Distance covered in first two hours = 70 × 2 = 140 km   Distance covered in next two hours = 80 × 2 = 160 km   Distance covered in first four hours   140 + 160= 
<gadget id="calculator">140 + 160</gadget>
<output>300</output>
300 km   Remaining distance= 345 – 300 = 45 km.   Now, this distance will be covered at the speed of 90 km/hr.   ∴ Time taken = 45⁄90 = 1⁄2 hour.   Total time= 4 + 1⁄2 = 41⁄2 hour   Answer 4 1⁄2 hours
<result>B</result>
A motor starts with the speed of 70 kmph with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms?