An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 5/3 hours, it must travel at a speed of:_________?

A. 660 km/hr
B. 680 km/hr
C. 700 km/hr
D. 720 km/hr
Distance = Speed x Time = 240 x 5 km
New time =5/3 hr
Hence, new speed = Distance/Time =240*5/5/3
=240×3=720 km/hr