- A21 km/h
- B18 km/h
- C24 km/h
- D15 km/h
Step-by-Step Solution
b − s = 12 and b − 2s = 9 ⇒ s = 3, b = 15. Doubled current = 6, so downstream = 15 + 6 = 21 km/h.
Answer: A) 21 km/h
When the current doubles, the upstream speed of a ferry drops from 12 km/h to 9 km/h. What is its downstream speed with the doubled current?
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