ODOD 3.6 km 2.1 km.hr-¹ Figure 2: Diagram of a boat travelling between two landings.
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A river flows with a constant speed of 2.1 km·hr−1. A motorboat makes a round trip between two boat landings on the the same bank and in a straight section of the river. The distance between the two landings is 3.6 km, and it takes 1 hour 40 minutes for the boat to make the round trip if the boat moves at a constant speed with respect to the water. Figure 2 shows a diagram of the boat on the river.
Calculate the speed of the boat relative to the water
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