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Time, Speed & Distance · Question 62 of 71

Question 62

EasyOriginal question

Lalit rows at 7.5 km/h in still water. The current flows at 1.5 km/h. How far upstream can he row in 40 minutes?

Options for question 62

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Upstream speed = 7.5−1.5=67.5 - 1.5 = 6 km/h.

  2. Distance =6×4060=4= 6 \times \frac{40}{60} = 4 km.

Worth noting

6 km is the downstream distance (9 km/h for 40 minutes). Upstream the current is subtracted.

Concept
Upstream speed = boat speed − stream speed
Typical time
35 s
Your time
—
The rule this testsBoats and streams
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