(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm not sure if I posted this in the right section, I apologize If I did anything wrong.

I am stuck on part 15(b),so I just wrote my answer down for the parts I got right because I felt that it is relevant information. I posted question 14 because question 15 is just an extension. The correct answer for 15(b) is 0.9min.

Question 14:

In his rowboat, Pierre heads directly across a river at a speed of 10km/h. The river is flowing at 6km/h.

a) What is the resultant speed of the boat?

b) What angle will the resultant path of the boat make with the shoreline?

c) If the rover is 120m wide, how far downstream will Pierre land on the opposite shore?

Answer (a) = 11.7km/h

Answer (b) = 59 degrees

Answer (c) = 72m

Question 15:

Refer to exercise 14. Suppose Pierre want to row directly across the river.

(a)At what angle relative to the shoe should he head?

(b)How long will this trip take?

Answer (a) = 53.1 degrees

Answer (b) = This is where I need help.

2. Relevant equations

velocity = distance/time

3. The attempt at a solution

The correct answer is: 0.9min. Please help!

Attempt 1:

From question 14: Distance = 120m = 0.12km

From question 14(a): Velocity = 11.7km/h

So; Time = 0.12/11.7

= 0.01025641 hours *60

= 0.62 min.

Attempt 2:

Distance = 120m

Velocity = 11.7km/h = 3.3m/s

So; Time = 120/3.3

= 36.4s /60

= 0.61min

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