Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

Two pipes take x minutes and (x+3) minutes respectively to fill a cistern. If together they fill the cistern in 3/1/13 ( it us in mixed fraction) minutes ,

find the value of x.


So...time taken by 1st pipe to fill the cistern in 1 min=1/x...and the time taken by the second pipe to fill the cistern in 1 min=1/x+3...so..time taken by both the pipes when you they are running together=1/40/13=13/40...so 1/x+1/x+3=13/40=>120+80x=13x^2+39x=>13x^2-41x-120=0=>13x^2-65x+24x-120=0=>(13x+24)(x-5)=0=>x=5 and x=-24/13..so we know time cannot be negative soo..x=5mins(ans)
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts