The Speed of a boat in still water is 25 kmph. If it can travel 10 km upstream in 1 hr, What time it would take to travel the same distance downstream?

A. 22 minutes

B. 30 minutes

C. 40 minutes

D. 15 minutes

• inner curved surface area=2*22/7*56*2=704
  outer curved surface area=2*22/7*56*3=1056
  tot=704+1056=1760m^2
  cost 1760*20= rs 35200
• 9 years agoHelpfull: Yes(20) No(2)
• Speed of boat in still water = 25 km/hr
  
  Speed upstream = 10⁄1 = 10 km/hr
  
  Speed of the stream = (25-10) = 15 km/hr
  
  Speed downstream = (25+15) = 40 km/hr
  
  Time taken to travel 10 km downstream = 1040 hours=10×6040= 15 minutes
  
• 9 years agoHelpfull: Yes(8) No(3)
• outer surface area= 2*22/7*3*56= 1056
  inner surface area= 2*22/7*2*56=704
  total surface area= 1056+704= 1760m^2
  cost of cement finishing= 1760*20= 35200/-
• 9 years agoHelpfull: Yes(6) No(0)
• Speed of boat in still water = 25 km/hr
  
  Speed upstream = 10⁄1 = 10 km/hr
  
  Speed of the stream = (25-10) = 15 km/hr
  
  Speed downstream = (25+15) = 40 km/hr
  
  Time taken to travel 10 km downstream = 10/40 hours=10×60/40= 15 minutes
  
• 9 years agoHelpfull: Yes(3) No(2)
• speed of the boat in still water=25kmph
  speed of upstream (a)=10kmph
  speed of downstream(b);
  25=1/2(10+b)
  speed of downstream(b)=40kmph
  time to travel downstream=10/40=1/4*60=15 minutes
• 6 years agoHelpfull: Yes(1) No(0)
• Ans=15 mints....
• 6 years agoHelpfull: Yes(0) No(0)