Question

while going upstream in a river by a boat . speed of the stream is __ from the speed of the boat​

Answer 1

Answer:

let the speed be x

the speed of the boat upstream equal to (18 - x) kilometre per hour and the speed off the boat downstream is equal to (18 + x) kilometre per hour

the time taken to go upstream =distance/speed=24/18 - x Hour

according to the question

• 24/18 - x - 24/18 + x=1
• 24 (18 + x)-24 (18 - x)=(18 - x)(18 + x)
• X^2 + 48 x - 324 =0
• using the quadratic formula we get
• X = -48 +- ✓48^2+1296/2 = -48-+ ✓3600/2
• =-48+-60/2=6 or -54
• since x is the speed of the stream it cannot be negative so we ignore the root is equal to - 54 therefore x is equal to 6 gives the speed of the stream as 6 kilometre per hour