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Question -

A plane left 40 minutes late due to bad weather and in order to reach its destination, 1600 km away in time, it had to increase its speed by 400 km/hr from its usual speed. Find the usual speed of the plane.



Answer -

Distance = 1600 km
Let usual speed of the plane = x km/hr
Increased speed = (x + 400) km/hr
According to the condition,
 
is not possible being negative or x – 800 = 0, then x = 800
Usual speed of the plane = 800 km/hr

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