- A30 minutes
- B20 minutes
- C45 minutes
- D15 minutes
Step-by-Step Solution
Day 1: downstream 18, so current = 3 and upstream = 12 km/h ⇒ 2.5 h. Day 2: downstream 20, current = 5, upstream = 10 km/h ⇒ 3 h. Difference = 30 minutes.
Answer: A) 30 minutes
The table records a launch with the same engine on two days. How much longer does a 30 km upstream run take on Day 2 than on Day 1?
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