Captain Umaima has a ship, the H. M.S. Khan. The ship is two furlongs from the dread pirate Nadia and her merciless band of thieves.
The Captain has probability
3
7
7
3

start fraction, 3, divided by, 7, end fraction of hitting the pirate ship. The pirate only has one good eye, so she hits the Captain's ship with probability
2
5
5
2

start fraction, 2, divided by, 5, end fraction.
If both fire their cannons at the same time, what is the probability that the Captain hits the pirate ship, but the pirate misses?