Get Started with ixamBee
Start learning 50% faster. Sign in now
Let the speed of the boat in still water be x km/h, and the speed of the stream be y km/h. Downstream speed = (x + y) km/h, and upstream speed = (x - y) km/h. Downstream: 40 / (x + y) = 5 Upstream: 40 / (x - y) = 8 From the downstream equation: x + y = 40 / 5 = 8. From the upstream equation: x - y = 40 / 8 = 5. Now solve: x + y = 8 x - y = 5 Adding both equations: 2x = 13 x = 6.5 km/h Thus, the speed of the boat in still water is 6.5 km/h.
A bomb at rest explodes into two pieces of unequal masses. Which of the following is necessarily true about the motion of the fragments?
Deficiency of which vitamin leads to bleeding gums?
Which organ controls reflex actions?
Where are the parotid glands located?
A body falls freely from a height of 80 m. Time taken to reach the ground is:
A person weighing 80 kg is standing in an elevator that is accelerating downward at 3 m/s². What is the apparent weight? (Take g = 10 m/ s²)
Tungsten is used for the construction of filament in an electric bulb because of its
Which of the following instrument is used to measure heat radiation?
Which of the following is a bacterial disease?
Which one of the following crops enriches nitrogen content in the soil?
