Library / /75 of 146

, 2018

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

On a training ride, Laura averages speeds of $12\text{ km/h}$ for 5 minutes, then $15\text{ km/h}$ for 10 minutes and finally $18\text{ km/h}$ for 15 minutes. What was her average speed over the whole ride?

(A) $13\text{ km/h}$ (B) $14\text{ km/h}$ (C) $15\text{ km/h}$ (D) $16\text{ km/h}$ (E) $17\text{ km/h}$

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.