A hiker walks 3.5 km uphill at 2 km/h, then 3.5 km downhill at 4 km/h. How long is the total hike?
Answer
2.625 hours
How to solve it
1
Uphill time: 3.5 ÷ 2 = 1.75 hours
2
Downhill time: 3.5 ÷ 4 = 0.875 hours
3
Total: 1.75 + 0.875 = 2.625 hours
Hints
Calculate time for each part separately
Use time = distance ÷ speed
Add both times