7:4 is the constant and is your answer
Every 12th box gets a whistle and a ball because 12 is the lowest common factor of 6 and 4.
11:45 ---> 01:20
11:45 + (00:15 + 01:00 + 00:20)
= 01:20
So your answer is:
01:35 which is 1 hr, 35 mins.
Answer:
I have solved the question in the picture in two different ways : simplification and factorisation I hope you find it useful bye:)