Please help me with this =) I really need it done!?

Question

While riding in your boat, you notice one wave pass by every two seconds. If the actual frequency of the waves is

1 Hz, with what speed are you moving through the water?

(The speed of the wave is 5 m/sec)

a. 5m/2s towards the waves

b. 5m/2s away from the waves

c. 1m/2s towards the waves

d. 1m/2s away from the waves

I know I need to use the equation...

f(observed)=f(actual) [v+v(obs)/v-v(s)]

f(observed)=observed frequency of the wave

f(actual)=actual frequency of wave from source

v=velocity of the wave through the medium

v(obs)=velocity of the observer

v(s)=velocity of the wave source

I don't know what "v" is!!! HELP!

Answer 1

Answer is b...

Because the observed frequency is lower than the actual... movement is "away from the waves"!

Wave-speed is 5 [m/s] traveling at halve the speed of the waves results in the observed doubling of the frequency!

travel at 2/3 wave-speed will give a tripling of the observed frequency!

travel at 3/4 wave-speed will give a quadrupling of the observed frequency!

etc...

Good luck.