Question

A boat sails along the shore. To an observer, the boat appears to move at a speed of 22 m/s, and a man on the boat walking forward appears to have a speed of 23.1 m/s. How long does it take the man to move 3 m relative to the boat?

A. 1.3 s
B. 2.7 s
C. 0.14 s
D. 0.13 s

Answer 1

Relative to the observer, the boat is moving at 22 m/s while the man is moving at 23.1 m/s. That means the man, relative to the boat, is moving at 23.1-22 = 1.1 m/s.

v=d/t, so t = d/v --> t = 3/1.1 = 2.7 s

Answer 2

Thanks matt101