Question

A man rows upstream 13 km and downstream 28 km taking 5 hrs each time. What is the velocity in (km/hr) of the current?

Answer 1

Speed upstream = \(\frac{13}{5}\) km/hr = 2.6 km/hr 

Speed downstream = \(\frac{28}{5}\) km/hr = 5.6 km/hr 

∴ Velocity of current = \(\frac12(5.6-2.6)\) km/hr 

= \(\big(\frac12\times3\big)\) km/hr = 1.5 km/hr.