He shucks 10 oysters in 5 minutes we need to know how many 5 minute units are in 60 minutes so 60/5 = 12 units
He can shuck 10 oysters in 5 minutes and there are 12 5 minute units in an hour so he can shuck 10*12 = <<10*12=120>>120 oysters in 1 hour
If he can shuck 120 oysters in 1 hour, so for 2 hours in can shuck 2*120 = 240 oysters
#### 240