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?
Opening the drawing…
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