Shelly biked 21 miles in 4 hours. what is shelly's average speed in miles per hour? at that same rate how many hours will it take shelly to bike 42 miles?

Shelly's average speed is 5.25 miles per hour.

It take 8 hours to travel 42 miles.

Step-by-step explanation:

Given : Shelly biked 21 miles in 4 hours

To Calculate :

Shelly's average speed in miles per hour.

At that same rate how many hours will it take Shelly to bike 42 miles?

Solution :

We know that shelly traveled distance = 21 miles

She covered 21 miles in hours = 4

Now to calculate her speed we will use formula :

So, Shelly's average speed is 5.25 miles per hour.

Now she traveled 42 miles with same speed (5.25 miles per hour)

Now time taken to cover 42 miles :

Hence it take 8 hours to travel 42 miles.