Solve this multiple-choice question and choose the correct option.

Introduction / Context:With-current and against-current speeds differ by twice the stream speed around the still-water rate. Given Data / Assumptions: b + s = 12 km/h; s = 1.5 km/h. Concept / Approach:Compute still-water b, then subtract s to get upstream. Step-by-Step Solution: b = 12 − 1.5 = 10.5 km/h; upstream = b − s = 10.5 − 1.5 = 9 km/h. Final Answer:9 km/hr

Curioustab

A man’s rate with the current is 12 km/h; the current is 1.5 km/h. Find his rate against the current.

Aptitude Boats and Streams Difficulty: Easy

Choose an option

A

9 km/hr
B

6.75 km/hr
C

5.25 km/hr
D

7.5 km/hr
E

—

Answer

Correct Answer: 9 km/hr

Explanation

Introduction / Context:With-current and against-current speeds differ by twice the stream speed around the still-water rate.

Given Data / Assumptions:

b + s = 12 km/h; s = 1.5 km/h.

Concept / Approach:Compute still-water b, then subtract s to get upstream.

Step-by-Step Solution:

b = 12 − 1.5 = 10.5 km/h; upstream = b − s = 10.5 − 1.5 = 9 km/h.

Final Answer:9 km/hr

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