A boat takes 06 min to cover a distance of 01 km in downstream while it takes 7\(\frac{1}{2}\) min to cover the same distance in upstream. Find speed of the current.
Answer & explanation
Correct answer: option 2
Speed of boat in downstream (D.S):
01 km → in → 06 min ⇒ 10 km → in → 60 min = 10 km/hr
Speed of boat in upstream (U.S):
01 km → in → 7\(\frac{1}{2}\) min ⇒ 8 km → in → 60 min = 08 km/hr
So, Speed of current = \(\frac{D.S\;-\;U.S}{2}\) = \(\frac{10\;-\;8}{2}\) = 1 km/hr