An aeroplane covers a distance at 240 km/h in 5 hours. To cover the same distance in 1⅔ hours, what speed is required?

First compute the distance, then divide by the new time.

Step-by-step calculation
Distance d = 240 × 5 = 1200 kmRequired time = 1⅔ h = 5/3 hRequired speed = d / time = 1200 / (5/3) = 1200 × 3 / 5 = 720 km/h

Verification
At 720 km/h for 5/3 h: 720 × (5/3) = 1200 km (same distance)

Final Answer
720 km/h