 
 <prompt> Rodney da Todd sun yi rowing a cikin kogin da ke 50 yards a cikin farko. Idan kogin ya zama 80 yards a cikin farko, yaya zai samu su (a seconds)? <response>: Farko tsakanin cikin ƙarfin da suka fara daga nan da suna tafiya zuwa gida shi ne 80-50 = 30 yards
Tsawon ƙarfin ya zama 2 yards kowace 10 m a cikin kogi, don haka suka buɗe (30/2)*10 = <<(30/2)*10=150>>150 mita
Idan ya tafi a kan hanyar 5m/s, zai tafi 150/5 = 30 seconds

Sami amsa zai kasance 30. 