
Concept explainers
To give the letter of the correct answer to find how fast can bill raw in still water.

Answer to Problem 18CR
The correct answer is b.
Explanation of Solution
Given that: Bill rowed 30 km upstream against a 2km/h current and back again in a total of 8h.
Formula:
Let speed be x
The speed in the upstream will be
Therefore, the total time for upstream will be
Similarly for the speed in the downstream will be
Therefore, the total time for downstream stream will be
Now , the sum of total time of upstream and downstream will be equal to 8h
Add both the equation (i) and (ii) and equate with total time of 8 hr.
Take LCM
Apply factor
Apply zero product property to find the value of equation.
The negative speed is not valid for the answer . So, the swim speed at 8 km/h.
Hence, the correct option is b.
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