An aeroplane covers a certain distance of 670 Kmph in 6 hours. to cover the same distance in 6 1/4 hours, it Must travel at a speed of Choose the correct choice from the following answers.
A) 440	B) 540	C) 643	D) 740	E) 250
Speed of aeroplane = 670 Kmph   Distance travelled in 6 hours   = 670 * 6= 
<gadget id="calculator">670 * 6</gadget>
<output>4_020</output>
4020 Km   Speed of aeroplane to acver 4020 Km in 25/4= 4020*4/25 = 643 Km   Answer 643.
<result>C</result>
An aeroplane covers a certain distance of 670 Kmph in 6 hours. to cover the same distance in 6 1/4 hours, it Must travel at a speed of