Two boats left an island at the same time to return to the same home port. their rates of speed differ by 4km/h. the faster boat reached the port in 3 hours. the other boat took 30 minutes longer. find the average speed of each boat.

Average speed of the two boats are 28 km/hr. and 24 km/hr.

Step-by-step explanation:

Let the average speed of the boat with larger speed is x km/h and that of the other boat is y km/h.

Now, given that x - y = 4 ...... (1)

If the distance, that the first boat covers in 3 hrs. is d km then the second boat covers d km in 3.5 hrs.

Therefore, and

Now, from equation (1), we can get

⇒

⇒ km/hr.

Again, km/hr.

Therefore, the average speed of the two boats is 28 km/hr. and 24 km/hr. (Answer)

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this