Same pattern as Printing machines. 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
At a school fair, Stall A and Stall B both scoop ice-cream cups for customers. Stall A scoops 4 more cups per minute than Stall B. The two stalls start scooping at the same time. After 45 minutes, Stall A closes to restock its tubs, while Stall B carries on scooping alone for another 15 minutes. By the time Stall B stops, both stalls have scooped the same total number of cups. Stall B stopped scooping at 3:15 p.m. (a) At what time did the two stalls start scooping? (b) How many cups did both stalls scoop altogether?
Work it out on paper, then check below. ▶ See the working
Question 2
Priya and Wei Ming wrap sweets by hand at a candy factory. Priya wraps 5 more sweets per minute than Wei Ming. They start wrapping together, and after 48 minutes Priya leaves for her break while Wei Ming carries on wrapping alone for another 12 minutes. By the time Wei Ming stops, the two of them have wrapped the same total number of sweets. Wei Ming stopped wrapping at 4:00 p.m. (a) At what time did they start wrapping? (b) How many sweets did they wrap altogether?
Work it out on paper, then check below. ▶ See the working