If 3 crows eat 30 worms in one hour, how many worms will 5 crows eat in 2 hours?
If 3 crows eat 30 worms in one hour, then each crow eats 30/3=<<30/3=10>>10 worms per hour.
5 crows will eat 5*10=<<5*10=50>>50 worms per hour.
Over two hours, 5 crows will eat 2*50=100 worms.
#### 100