Question

Leah drives 45 miles per hour for 2 hours then 32 miles per hour for 90 minutes . What is her average speed

Answer 1

average speed = $\frac{total distance}{total time}$

45 mph for 2 hours to distance = 45miles x 2 hours = 90 miles

convert 90 minutes to hours: $\frac{90 minutes}{60 minutes} × 1 hour =1.5 hours$

32 mph for 1.5 hours = 48 miles

average speed = $\frac{90+48 miles}{2+1.5 hours} = 39.429 miles/hour$

Answer 2

Answer:

 =39.42857143 miles per hour

Step-by-step explanation:

To find the average speed, we need to the total distance and the total time

Distance 1

45 miles for 2 hours

45*2 = 90 miles

Distance 2

90 minutes * 1 hour/60 minutes = 1.5 hours

32 miles * 1.5 hours =48 miles

The total distance = 90+48 = 138 miles

The total time = 2 +1.5 = 3.5 hour

The average speed = total distance/ total time

                                  = 138/3.5

                                  =39.42857143 miles per hour