Motor boat can travel at the speed of 20 km per hour. How far can a motor boat go in six hours?
1. 125 km
2. 120 km
3. 110 km
4. 115 km
tick the correct answer
Answers
Answered by
0
Answer:
4 km/hr
Step-by-step explanation:
As per given condition
20−x
48
−
20+x
48
=1
⟹48[
20−x
1
−
20+x
1
]=1
⟹[
(20−x)(20+x)
20+x−20+x
]=
48
1
⟹
400−x
2
2x
=
48
1
⟹96x=400−x
2
⟹x
2
+96x−400=0
⟹x
2
+100x−4x−400
⟹x(x+100)−4(x+100)=0
⟹(x−4)(x+100)=0
Either, x=4 or x=−100
∵ Speed cannot be negative ∴x=4 km/hr is considered.
∴ the speed of the stream =4 km/hr
Answered by
1
Answer:
No of km pre hour is 20km
No of km six hours is 20×6
=2. 120
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