What is 8/13 divided by (-4/13) in simplest form? and equation

Seth practice piano for 1 1/3 hours on saturday and 5/6 hour on sunday for much longer did he practice on saturday than on sunday?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists