A boat takes 5 hrs to cover a distance of 30 km in downstream while it takes 01 hr extra to cover the same distance in upstream. Find speed of boat in still water.
Answer & explanation
Correct answer: option 2
Let speed of boat = x
Let speed of stream = y
Speed = \(\frac{Distance}{Time}\)
Speed of boat in downstream (x + y) = \(\frac{30}{5}\) = 6 ....(i)
Speed of boat in Upstream (x - y) = \(\frac{30}{5 + 1}\) = 5 .....(ii)
Add (i) and (ii)
x + y = 6
x - y = 5
2x = 11
x = 5.5
Speed of boat in still water = 5.5 km/hr