Australian Immigration Guidance Series

Distance is constant, speed is inversely proportional to time. In this problem, the ratio of the speed up the mountain to the speed down the mountain is 60: 80 = 3: 4.

The time to go up the mountain should be inversely proportional to the time to go down the mountain, which is 4: 3.

The climbing time is 70 × 4/(4+3)=40 (minutes).

Distance: 60 × 40=2400 meters

Round trip * * * line: 2400 × 2=4800 (meters)