a) Answer;
50 seconds
Solution;
t = d /v
where t is the time taken, d is the distance and v is the speed
d= 70 m and s= 1.4 m/s
Therefore;
t = 70/1.4
= 50 seconds
b) Answer;
40 meters
Solution;
dc = Vc × t
Where dc is the distance down stream, Vc is the velocity downstream and t is the time taken
Vc = 0.8 m/s
t = 50 seconds
Therefore;
dc = 0.8 × 50
= 40 meters
c) Answer;
55 degrees
Solution;
cosA = 0.8/1.4
A = 55.15 ° with the horizontal (shore) upstream
Therefore; the angle to aim from the shore is 55°
