Question : An aeroplane covers a certain distance at a speed of 400 km/hr in 8 hours. To cover the same distance in 5 hours, the speed of the aeroplane will be:
Option 1: 640 km/hr
Option 2: 680 km/hr
Option 3: 580 km/hr
Option 4: 600 km/hr
Correct Answer: 640 km/hr
Solution :
Given: An aeroplane covers a certain distance at a speed of 400 km/hr in 8 hours.
Here, distance = (400 × 8) km, time = 5 hours
So, the required speed = $\frac{\text{distance}}{\text{time}}$
= $\frac{400×8}{5}$
= 640 km/hr
Hence, the correct answer is 640 km/hr.
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