A train covers a certain distance at a speed of 320kmph in 4 hours. To cover the same distance in 2 hours, it must travel at a speed of  Choose the correct choice from the following answers
A) 850km/hr
B) 800km/hr
C) 740km/hr
D) 640km/hr
E) 600km/hr
Explanation:   640km/hristance = 320×4 = 1280km   Required speed = (1280/2)= 
<gadget id="calculator">(1280/2)</gadget>
<output>640</output>
640km/hr   Answer: Option 640km/hr
<result>D</result>
A train covers a certain distance at a speed of 320kmph in 4 hours. To cover the same distance in 2 hours, it must travel at a speed of