Write an expression for the speed of the boat coming back from the island in terms of the other boat's speed. let x be the speed of the boat you are taking to the island.

Speed of Boat that you are taking to the Island =x Km/hr or x m/sec.

Let u Km/hr or x m/sec, be the speed of water.

⇒Speed of Water while Going Upstream

=Speed of Boat+Speed of Water

=(x+u) Km/hr or (x-u) m/sec.

⇒Speed of Water while Going Downstream, that is speed of the boat coming back from the island

=Speed of Boat-Speed of Water

=(x-u) Km/hr or (x-u) m/sec.              

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

step-by-step explanation:

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