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Let us consider a boat which moves with ...

Let us consider a boat which moves with a velcity `v_(be)=5 km h^(-1)` relative to water, At time `t=0`, the boat passes through a piece of cord floating in water while moving downstream. If itturns back at time `t=t_(1)`, when and wher does the boat meet the cork again ? Assume `t_(1)=30 min`,

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Consider an observer attached with cork. The boat has same speed upstream and downstream relative to cork. Hence, if the boat travels for 30 min. while moving away from cork, it travel the same time while approaching the cork.
Therefore the boat meet the cork at
T = 2t = 60 min. 1h
The distance travelled by boat in this time,
`S = V_(BW) xx T = 5 xx 1 = 5km`
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