The rate of the jet stream is 100 miles per hour Traveling w

The rate of the jet stream is 100 miles per hour. Traveling with the jet stream, an airplane can fly 1800 miles in the same amount of time as it takes to fly 1200 miles against the jet stream. What is the airplane\'s average rate in calm air? miles per hour

Solution

SOLUTION

Let the aeroplane\'s average rate in calm air be v m/s .

Now,

v + 100 = 1800 ......................1)

and    v - 100 = 1200    ........................2)

adding 1) and 2)

2v = 3000

or   v = 1500 m/s