An aeroplane covers a certain distance at a speed of 240 kmph in 4 hours. To cover the same distance in 1 2/3 hours, it must travel at a speed of:
Choices:  A) 520  B) 620  C) 576  D) 740  E) 720
Distance = (240 x 4) = 960 km.   Speed = Distance/Time   Speed = 960/(5/3) km/hr. [We can write 1 2/3 hours as 5/3 hours]   Required speed = (960 x 3/5) km/hr = 576 km/hr   Answer 576) 576 Km/hr
<result>C</result>
An aeroplane covers a certain distance at a speed of 240 kmph in 4 hours. To cover the same distance in 1 2/3 hours, it must travel at a speed of: