Danielle needs to walk 4 miles. if she wants to reach her destination in 50 minutes ( hour), how fast does she need to walk? a.200 miles per hour b.4.8 miles per hour c.12.5 miles per hour d.3.3 miles per hour

B. 4.8 miles per hour

Step-by-step explanation:

We are given that,

Distance needed to walk by Danielle = 4 miles

Time needed to reach the destination = 50 minutes = 0.83 miles

It is required to find the speed needed by Danielle.

Since, we know,

i.e.

i.e. Speed = 4.8 miles per hour

Hence, she needs to walk 4.8 miles per hour to reach her destination.

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).