Ireally need . it's pythagorean theorem and i don't understand how to do this question. two trains left metropolis at the same time. one traveled south at 50mph. the other traveled east at 40mph. how far apart were the trains at the end of three hours?

Francis is getting new carpet tiles in his living room and den. his living room and den are connected. he needs to figure out how much carpet he needs and the cost involved. if each tile costs $2.00 per sq ft, how much would it cost to have new tile put in the den? a) $24 b) $36 c) $48 d) $54 plz awnser soon