speed of boat in still water is 23km/h. if speed of boat against stram is 13 km/h. what is speed of stream
Answers
Answered by
6
Step-by-step explanation:
Given :
Speed of boat in still water =15 km/hr
Let x be speed of the stream in km/hr
Speed of the boat upstream =15−x
Speed of the boat down stream =15+x
Time taken for upstream T
1
=
15−x
30
Time taken for downstream T
2
=
15+x
30
Given, T
1
+T
2
=
2
9
=
15−x
30
+
15+x
30
=
2
9
=30(
15−x
1
+
15+x
1
)=
2
9
=30(
(15−x)(15+x)
15+x÷15−x
)=
2
9
=
225−x
2
30×30
=
2
9
=
225−x
2
100
=
2
1
⇒225−x
2
=200
⇒x
2
=25
⇒x=5 ....(∵x is +ve)
⇒x=5 km/hr
Speed of the stream =5 km/hr.
Answered by
0
Answer:
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream. Explanation: Speed downstream = (13 + 4) km/hr = 17 km/hr.
Similar questions
Social Sciences,
23 days ago
Science,
23 days ago
Hindi,
23 days ago
History,
1 month ago
Math,
9 months ago