Question

It takes Mary $30$ minutes to walk uphill $1$ km from her home to school, but it takes her only $15$ minutes to walk from school to home along the same route. What is her average speed, in km/hr, for the round trip?

Answer 1

Answer: 2.6667 km per hour approximately

Step-by-step explanation

She walks a total of 30+15 = 45 minutes which converts to 45/60 = 0.75 hours.

The total distance is 1+1 = 2 km.

speed = distance/time

speed = (2 km)/(0.75 hours)

speed = (2/0.75) km per hour

speed = 2.6667 km per hour approximately