What is her average speed?

Question

a commuter has a 20-mile trip each way from home to work. it takes her 30 minutes to get to work and 60 to get home.

Answer 1

Wrong.  The commuter goes 40 miles in 1.5 hours.  That makes the average speed 26.667 mph.

Answer 2

26.666666666666666667 mph

Answer 3

Average speed is 30 MPH.

Her return trip is 20 miles in an hour (= 20 mph)

To work is half the time  (twice as fast = 40 mph)

Avg. speed is therefore 30 mph

Answer 4

d=rt

d=40 miles

t=1.5 hrs

r=40/1.5=80/3

which is about 26.67

Answer 5

Alright.

Your commuter goes 20 miles right, so the formula to find her average speed is d = rt, where d is distance, r is rate, and t is time.

40 = r1.5

40/1.5 = 26.6 repeat.

Therefore, her average speed both ways is about 26.7 mph.