Please help. Ralph and Joe leave school walking in opposite directions. Ralph walks 1 km per hour faster than Joe. after 2 hours they are 30 km apart. what is the rate of each

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?