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Maths Week Riddle #2

October 14, 2025

Maths Week Riddle #2

Yesterday we asked: When does 9 + 5 =2 
The answer was… On the clock! 9pm + 5hours=2am. Well done to everyone who figured it out!

Now it’s time for Maths Week Riddle #2 

Todays Riddle:
Four people need to cross a bridge at night with one torch. They all walk at different speeds — 1, 2, 7, and 10 minutes — and only two can cross at a time. When two cross, they move at the slower person’s pace. The torch must always be carried across. What is the minimum time needed for everyone to cross safely?

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