The speed of a motor boat in still water is 25km/hr. In a river it goes 60km downstream and comes back the same Distance up stream in 5hours . Find the speed of the current.
Answers
Answered by
3
Answer:
Step-by-step explanation:
speed of the boat upstream=distance/tme=60km/5hrs=12km/hr
therefore speed of the boat=speed of the boat upstream- speed of the boat in still water=25-12=13km/hr
Answered by
1
Answer:
C) 25 km/h
Explanation
Let speed of boat be x km/h.
Given speed of current = 5 km/h
Therefore, Upstream speed of boat = (x-5) km/h
Downstream speed of boat = (x + 5) km/h
According to the question,
10
x−5
+
10
x+5
=
50
60
10(
x+5+x−5
x2−25
)=
5
6
12×2x=x2−25
x2−24x−25=0
x2−25x+x−25=0
(x−25)(x+1)=0
Therefore, x = 25 [because,x≠−1]
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