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?

04 km/hr 03 km/hr 05 km/hr 06 km/hr

03 km/hr

\(\frac{54}{5x + x}\) + \(\frac{48}{5x - x}\) = 7   \(\frac{9}{x}\) + \(\frac{12}{x}\) = 7 x = 3 Speed of current = 3 km/hr