Question

A plane flew 145km/h faster when it was flying with the wind than it would have flown with still air, if it's speed with the wind was 970km/h, find the speed of the plane in still air

Answer 1

Speed of plane in still air is 825 km/h

Explanation:

Given:

Speed of plane with the wind is 145 km/h faster than what it would have with still air.

Speed of plane with wind = 970 km/h

To find speed of plane in still air.

Solution:

Let speed of plane in still air be =
`x\ km/hr`

So The speed of plane with wind would be given as =
`x+145\ km/hr`

Now Given:

Speed of plane with wind is given =970 km/h

So, we have:

`x+145 =970`

Now Solving for "x" we get

Subtracting both sides by 145.

`x+145-145=970-145\\\\x=825`

Hence, speed of plane in still air is 825 km/h