Question 2
Lenny left home for school without his homework, so Mum left home shortly after to catch up to him. Ten minutes after receiving his homework from Mum, Lenny arrived at school and Mum arrived home. If Mum’s walking speed was twice Lenny’s, how many minutes did Mum take to catch up with him?
Assume Mum walks at the same constant speed on her outward and return trips along the same route.
Assume Mum walks at the same constant speed on her outward and return trips along the same route.