Note: Please correct at timestamp 17:35 , the angle will be 0 degree (not 90 degree) and the value of cos0 will be +1 (not cos90=1) and I have corrected this at timestamp 19:03. Sorry for that.
In this video, I will discuss about the formulas of the topic-
1. Rain umbrella problems
2. River boat problems
3. River crossing problems
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