Question

shelly biked 21 miles in 4 hours. how long will it take shelly to bike 63 miles?

Answer 1

12 hours because 63 divided by 21 is 3, then you multiply 3 and 4 to get 12

Answer 2

Answer:  The required time is 12 hours.

Step-by-step explanation:  Given that Shelly biked 21 miles in 4 hours.

We are to find the time taken by Shelly to bike 63 miles.

We will be using the UNITARY method to solve the problem.

We have

Time taken by Shelly to bike 21 miles = 4 hours.

So, time taken by Shelly to bike 1 mile will be

$\dfrac{4}{21}~\textup{hours}.$

Therefore, time taken by Shelly to bike 63 miles is given by

$\dfrac{4}{21}\times63=4\times3=12.$

Thus, the required time is 12 hours.