Question

A jet flew for 2 hrs before strong head winds reduced its speed by 40mph. If it took the plane 5 hrs to travel 1,380 miles, find its speed before flying into the head winds.

Answer 1

As per the problem

A jet flew for 2 hrs before strong head winds reduced its speed by 40 mph.

It took the plane 5 hrs to travel 1,380 miles

Total time=5 hrs, Time of fly before headwinds
`=2`,

Time of fly in headwinds
`=5-2=3 hrs`

Let the speed before head winds
`=v\\`

Then speed in headwinds
`=(v-40)\\`

As we know that

`image`

Hence using this formula and the given data we can write

`image`

Hence speed before flying into the headwinds=300mph