5. A motorboat with a speed of 20 km/h takes 2 hours to cover a certain distance downstream. The speed of the stream is 10 km/h. How much time will the motorboat take to cover the same distance upstream? (1) 6 hours (2) 4 hours (3) 5 hours (4) 2 hours
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. A motorboat with a speed of 20 km/h takes 2 hours to cover a certain distance downstream. The speed of the stream is 10 km/h. How much time will the motorboat take to cover the same distance upstream? (1) 6 hours (2) 4 hours (3) 5 hours (4) 2 hours
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6 hours
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