mother plans to buy 1/2 kilogram of chicken and 2/5 kilogram of beef. how many kilograms of meat does she plan to buy?

A.7/10
B.8/10
C.6/10
D.10/7

Alma ran for 7/8 hour and walk for 1/2 hour to practice for a race. how much longer did she run than walk?

A.3/8
B.7/9
C.7/10
D.9/10