Two boats start together and race across a 42 km wide lake and back. Boat A goes

Question

Two boats start together and race across a 42 km wide lake and back. Boat A goes across at42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it isgetting, returns at 63 km/h. Turnaroundtimes are negligible, and the boat that completes the round-tripfirst wins. (a) Which boat wins? (Or is it a tie?) 1 boat A
boat B
it's a tie

By how much?
2 km

(b) What is the average velocity of the winning boat?
3 km/h

please explain, thanks!!!
(a) Which boat wins? (Or is it a tie?) 1 boat A
boat B
it's a tie

By how much?
2 km

(b) What is the average velocity of the winning boat?
3 km/h

please explain, thanks!!!
1 boat A
boat B
it's a tie
1 boat A
boat B
it's a tie
1

Explanation / Answer

Part 1) Boat A wins. after one hour, it is across the lake, and BoatB is only halfway. after two hours Boat A wins, and Boat Bhas just reached the far shore. Part 2) since Boat B has just reached the far shore, the distance Boat Awins by is 42 km Part 3) average velocity is x/t=84km/2hr=42km/hr

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