A motor boat whose speed is 18km/hr in still water takes 1hr more to go 24km upstream than to return downstream to the same spot. Find the speed of the stream.
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Answered by
5
refer to above photo
Do calculation if u have dought.
Hope it hlps u.
Do calculation if u have dought.
Hope it hlps u.
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Answered by
13
Hello friend your answer is
Let speed of stream =x
boat speed =18
distance =24
upstream =18-x
downstream =18+x
according to question
24/18-x-24/18+x=1
take lcm and we get
24(18+x)-24(18-x) /18²-x²=1
24(18+x-18+x)=324-x²
24(2x)= 324-x²
48x.= 324 -x²
x²+48x-324
do factorise and we get
b²-4ac
2304+1296
3600
x= -48+60/2
=6
and -48-60/2=108/2=-54
Let speed of stream =x
boat speed =18
distance =24
upstream =18-x
downstream =18+x
according to question
24/18-x-24/18+x=1
take lcm and we get
24(18+x)-24(18-x) /18²-x²=1
24(18+x-18+x)=324-x²
24(2x)= 324-x²
48x.= 324 -x²
x²+48x-324
do factorise and we get
b²-4ac
2304+1296
3600
x= -48+60/2
=6
and -48-60/2=108/2=-54
PriyaRajput1:
Ty dear
welcome
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