Trolley park

In a supermarket, there are two lines of tightly packed trolleys. What is the length of one trolley?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



In a supermarket, there are two lines of tightly packed trolleys. The first line has ten trolleys and is $2.9\text{m}$ long. The second line has twenty trolleys and is $4.9\text{m}$ long. What is the length of one trolley, in m?

Image
Trolley Park


 


If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.