The boat traveled 20 km downstream from the marina and then returned. The whole trip taked 7 hours. The raft traveled from the same place and it traveled 12 km away from the pier. What is the river flow rate?

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?