Let the speed of the stream bem
for the speed of the boat stream (18-
(18+)
Answers
Answered by
0
Answer:hiiii...........
Step-by-step explanation:
Answered by
2
Answer:
Step-by-step explanation:
Given speed of boat in still water = 18 km/hr
Let speed of stream be X km/hr
Speed of boat upstream = speed of boat in still water - speed of stream
= (18-x) km/hr
speed of boat downstream = (18+x) km/hr
Time of upstream journey = Time of downstream journey + 1 hr
speedofboatupstream
Distancecoveredbyupstream
=
speedofboatdown
Distancecovereddown
=+1hr
(18−x)km/hr
24km
=
(18+x)km/hr
24km
+1hr
18−x
24
−
18+x
24
=1hr
(18−x)(18+x)
432+24x−432+24x
=1
48x=18
2
−x
2
x
2
+48x−324=0
x
2
+54x−6x−324=0
x(x+54)−6(x+54)=0
(x+54)(x−6)=0
x=−54 or x=6
speed cannot be negative
so x=6
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