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.

Answer 1

Answer: $2\dfrac14\text{ hours}$

Step-by-step explanation:

Given:  It takes a robin $1\dfrac12$ hours to fly 45 miles.

$1\dfrac12=\dfrac32$

Speed of robin= $\dfrac{distance}{time}=\dfrac{45}{\dfrac32}$

$\dfrac{45}{3}\times2= 15\times2= 30\text{ miles per hour}$

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 = $\dfrac{45}{20}=\dfrac{9}{4}=2\dfrac14\text{ hours}$

Hence, it will take $2\dfrac14\text{ hours}$  by a blue jay to fly that same distance.