Willa's late,
They locked the gate
She didn't run
and missed the fun,
but here's her homework...no harm done
Nine minute eggs
Start both timers at the same time (Call the 7 min, 'Big' and the 4 min, 'Little').
After 4 min, Big has 3 min of sand left and Little is at zero. so we must flip Little a second time.
After 3 min, Big is now at zero and there's still 1 minute left in Little. (7 minutes have elapsed) Flip Big.
While (eight) minute from Little elapses, Big is dropping its own minute of sand on the bottom. and has 6 minutes of sand remaining on top ( at this point, 8 minutes have elapsed).
Flip Big so that 1 min of sand is now on top and the other six on the bottom. Now you can measure your extra minute and that's how you get to minute 9.
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