The speed of boat and the stream are in the ratio 5 : 1. If the boat takes 7 hrs. to go 54 km downstream and 48 km upstream, then find the speed of current?
Answer & explanation
Correct answer: option 2
\(\frac{54}{5x + x}\) + \(\frac{48}{5x - x}\) = 7
\(\frac{9}{x}\) + \(\frac{12}{x}\) = 7
x = 3
Speed of current = 3 km/hr