Mary needs to row her boat across a 160 m-wide river that is flowing to the east at a speed of 1.5 m/s. Mary can row with a speed of 3.6 m/s. If Mary points her boat due north, how far from her intended landing spot will she be when she reaches the opposite shore? What is her speed with respect to the shore?

66.67 m, 44.44 s

Explanation:

Given

Velocity of flow is

Mary can row with speed

Width of the river

Flow will drift the Mary towards east, while Mary boat will cause it to travel in North direction

time taken to cross river

Flow will drift Mary by

Velocity w.r.t shore is

radiation warms things up temp rises convection currents air circ windy weather

double the distance = divide strength by 4