A motor car starts with a speed of 70km/hr with its speed increasing every 2hours by 10kmph. In how many hours will it cover 345kms?
Pick:
A) 3hours
B) 2hours 30mnts
C) 4hours
D) 4hours 30mnts
E) 5hours
Distance covered in first 2hours = 70*2= 
<gadget id="calculator">70*2</gadget>
<output>140</output>
140km   Distance covered in next 2hours= 80*2= 
<gadget id="calculator">80*2</gadget>
<output>160</output>
160km   remaining distance= 345- (140+160)= 
<gadget id="calculator">345- (140+160)</gadget>
<output>45</output>
45km   speed in the fifth hour= 90km/hr   total time to cover 45km = 45/90 = 1/2 hr   total time taken = 4+(1/2) = 4hours 30minutes.   correct option is 4hours 30mnts
<result>D</result>
A motor car starts with a speed of 70km/hr with its speed increasing every 2hours by 10kmph. In how many hours will it cover 345kms?