Question
Speed of a boat in still water is 15 kmph and speed of
stream is 13 kmph. A man rows to a place at a distance of 56 km and come back to starting point. The total time taken by him is:Solution
Rate upstream = 15 – 13 = 2 kmph Rate downstream = 15 + 13 = 28 kmph Time taken to go upstream = 56/2 = 28 hr Time taken to go downstream = 56/28 = 2 hr Total time = 28 + 2 = 30 hrs
Estuarian fish culture is defined as a culture of fish in
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कोडेक्स मानक निम्न में से क्या हैं ?
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