Does anyone know the answer what to add and multiply because i really don't get it

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?

Hi i need i need to get all a’s and i really need some

Mens' heights are normally distributed with u 68 in and o 6 in. womens' heights have u 65 in with o 4 in. dan is 70 in tall and amy is 68 in tall. who is relatively taller? are they unusually tall?