Question 1120602
A courier travels due north at and average speed of 40km/h for 6 minutes to collect a parcel, before travelling 10km due East to deliver it. He then travels due south at an average speed of 30km/h for 12 minutes to collect another parcel. Find the shortest distance between the courier and his starting point.
<pre>Correct answer: {{{highlight_green(matrix(1,3, sqrt(10^2 + 2^2), "=", 2sqrt(26)))}}}