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+1 vote
12.9k views
in Mathematics by (51.7k points)
An aeroplane takes 1 hour less for a journey of 1200 km if its speed is increased by 100 km/hr from its usual speed. Find its usual speed.

1 Answer

+1 vote
by (266k points)
 
Best answer

Now, speed is increased by 100 km/hr and the time has taken is 1 hour less for the same journey.

⇒ Speed of the plane after increased = (x +100) km/hr and Time is taken by plane with

Since speed cannot be negative so, x = 300 ∴ usual speed of the plane = 300 km/hr

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