Problem 1: A ship leaves a port P and travel 30 km due north. Then it changes course and travels 20 km in a direction 300 east of north to reach port R. Calculate the distance from P to R.
Given Distance 1 = 30 km due north
Distance 2 = 20 km at 300 east of north
Required Displacement between P and R
Details Draw the sketch as below.
P is the point from where the ship takes the start. If Q is the point from where the ship takes the turn to right, then according to the chosen scale
PQ = 1.5 cm, QR = 1 cm.
Measure PR which is about 2.4 cm. Convert to kilometers according to the chosen scale;
2.4 * 20 = 48.4 km
This is the distance between the two ports.
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