Insert two arithmetic means between -2 and 13.
a. 1, 10
b. 3, 8
c. 2, 9
d. 4, 7

A1 = -2

a4 = 13

13 = -2 + d ( 4-1 ) 

13 = -2 + 3d

d = 15/3 = 5

a2 = -2 + 5 = 3

a3 =  3 + 5= 8 

3, 8  (B)

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.