A launch does the same out-and-back run once on a still lake and once on a flowing river (same distances, same engine). Which statement is always true?

Question

Accepted Answer

The river trip takes longer. Round-trip time = 2db/(b² − s²), which exceeds 2d/b whenever s > 0. The slow upstream leg costs more time than the downstream leg saves (e.g. b = 10, s = 2: 2.08 h vs 2 h for 10 km each way).

A launch does the same out-and-back run once on a still lake and once on a flowing river (same distances, same engine). Which statement is always true?

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Boats & Streams practice