It is a saturday morning and jeremy has discovered he has a leak

It is a Saturday morning and Jeremy has discovered he has a leak coming from the water heater in his attic. Since plumbers charge extra on weekends. Jeremy is planning to use buckets to catch the dripping water. He places a bucket under the drip and steos outside to walk the dog. In a half an hour, the bucket is 1/5 of the way full.

What is the rate at which the water is leaking per hour?