A river flows with a uniform velocity $v.$ A

person in a motorboat travels $1\mathrm{.}22km$ up$-$

stream, at which time a $log$ is seen floating by$.$

The person continues to travel upstream for

$49\mathrm{.}4$min at the same speed and then returns

downstream to the starting point, where the

same log is seen again.

Find the flow velocity of the river. Assume

the speed of the boat with respect to the water

is constant throughout the entire trip. $($Hint:

The time of travel of the boat after it meets

the $log$ equals the time of travel of the log$.)$

Answer in units of $\frac{m}{s}.$ Answer in units of

$\frac{m}{s}.$