Question

A boat , whose speed in still water is 15 km/h to takes total time 4 hours 30 minutes for Going 30 km in the direction of flow of stream and to come back at the same place. Find the speed of the stream .​

Answer 1

Answer:

x =5km/h

Step-by-step explanation:

Let the speed of the stream be x km/hr 

Then Speed of boat downstream =(15+x) km/hr

Speed of boat upstream  =(15−x) km/hr

Therefore, 15+x30+15−x30=421=29

⇒(15+x)(15−x)30(15−x)+30(15+x)=29

⇒225−x2900=29

⇒200=225−x2

⇒x2=25

⇒x=5 km/hr