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.              

answer: 457.14

step-by-step explanation:

205 - 45 = 160

160 / .35 = 457.142857

(a) the volume of the cone is 20/3 in3

hence, option a is correct.