Answer:
Speed of the river =
km per hour
Step-by-step explanation:
Speed of the boat in still water = 4 km per hour
Let the speed of the river = v km per hour
Speed of the boat upstream = (4 - v) km per hour
Time taken to cover 6 km = 
=
hours
Speed of the boat downstream = (4 + v) km per hour
Time taken to cover 12 km =
hours
Since, time taken by the boat in both the cases is same,

6(4 + v) = 12(4 - v)
24 + 6v = 48 - 12v
12v + 6v = 48 - 24
18v = 24
v = 
v =
km per hour
96 divided by 24 is 4. The unit rate is 4/1. 4 represents raisins, and the 1 represents the cashew.
Answer:
8
Step-by-step explanation:
8% is the annual interest rate. Since, only 3 month has been passed in the year end so, interest accrue of only 3 months.
8% is the interest of 12 months. So, 8%/12 is the interest rate of 1 month. But we want 3 month of interest rate. Multiplying (8%/12)*3, we will get 3 month interest rate.
Note, that we have substituted x with 8. Because, we need interest rate of 3 month, and 8 is the interest rate of 12 months.