Question

A robin can fly 10 miles per hour faster than a blue jay. It takes a robin 1 1/2 hours to fly 45 miles.

How many hours will it take a blue jay to fly that same distance?

Answer 1

Answer:
`2\frac14\text{ hours}`

Explanation:

Given: It takes a robin
`1\frac12` hours to fly 45 miles.

`1\frac12=\frac32`

Speed of robin=
`(distance)/(time)=(45)/(\frac32)`

`(45)/(3)*2= 15*2= 30\text{ miles per hour}`

A robin can fly 10 miles per hour faster than a blue jay. It

Speed of Blue jay = Speed of robin - 10 miles per hour

= 30 miles per hour - 10 miles per hour

= 20 miles per hour

Time taken to cover 45 miles =
`(45)/(20)=(9)/(4)=2\frac14\text{ hours}`

Hence, it will take
`2\frac14\text{ hours}` by a blue jay to fly that same distance.