Answer:
Total distance travelled in 2 hours is 8kilometres.
Explanation:
First, you have to find the speed of the boat that travel 20km for 5hr. Using the formula, speed = distance/time :
S = D/T
D = 20km
T = 5 hours
S = 20/5
= 4km/hr
We know that the boat travel at a constant speed during the tour so niw, we have to find the distance travelled during first 2 hours. Using the formula, D = S×T :
S = 4km/hr
T = 2hr
D = 4×2
= 8km