Same pattern as Ahmad's walk to school and back. New numbers, new story. Try each one on paper, then check the working below — or watch it drawn out, the same way the problem above is.
Question 1
Priya cycles from her house to the library at 12 km/h and cycles back home at 8 km/h. The library is 24 km away. What is her average speed for the whole trip?
Work it out on paper, then check below. ▶ See the working
Question 2
A rowing boat travels 15 km upstream at 6 km/h, then rows the same 15 km back downstream at 10 km/h. What is the boat's average speed for the whole journey?
Work it out on paper, then check below. ▶ See the working
Question 3
A delivery van drives from the depot to a warehouse at 60 km/h, then drives back to the depot at 40 km/h. The warehouse is 120 km away. What is the van's average speed for the whole trip?
Work it out on paper, then check below. ▶ See the working