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CBSE Class 10 Answered

Dear sir/mam,
 
Actually I want to know about sums based on upstream and downstream. Also how can I slove it. Can u even explain these two terms???
 
Siddhi
Asked by siddhipawar932 | 13 Aug, 2016, 08:48: PM
answered-by-expert Expert Answer
begin mathsize 16px style Distance equals Speed cross times Time Time equals Distance over Speed Speed equals Distance over Time Now comma space if Speed space of space straight a space boat space in space still space water equals space straight u space km divided by hr Speed space of space the space current equals straight v space km divided by hr Then comma Speed space upstream equals left parenthesis straight u minus straight v right parenthesis space km divided by hr Spped space downstream equals left parenthesis straight u plus straight v right parenthesis space km divided by hr Example colon straight A space motor space boat space can space cover space 30 space km space upstream space and space 28 space km space downstream space in space 7 space hrs. It space can space cover space 21 space km space upstream space and space returns space in space 5 space hrs. space Find space the space speed space of space the space boat space and space the space stream. end style
 
Answered by Rashmi Khot | 16 Aug, 2016, 09:06: AM

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