A fisherman Can row upstream at 1mph and downstream 4 mph. He started rowing upstream until he got tired and then towed downstream to his starting point. How far did the fisherman row if the entire trip took 6 hours?

Idon't want to fail summer school.the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table.the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.