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 | 13th Aug, 2016, 08:48: PM

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 | 16th Aug, 2016, 09:06: AM