pls answer guys i need your help

1)"It takes a motorboat 2 hours to go 30 miles downstream and 3 hours to return. find the rate of the current and rate of the boat in still water.

2)Alex walk a certain distance at the rate of 8 miles an hour and returns at the rate of 6 miles an hour. if the total time takes him 5 hours and 5 min., what is the total distance of his walk?

3) Anastacia takes the 11:00 am trip f a Ceres Bus for Hinobaan. One and a Half hours later, her father followed her using their car 75 kph. Assuming her father followed her using their car at 5o kph, at what time will his father overtakes the bus?

4)Pump A can fill a pool in & hours while Pump B can do the same in 10 hours. Pipe C can empty the pool in 15 hours. how long will it take for two pumps to fill the pool when accidentally, Pipe C was left open?

thanks for answering..