A person travels 40 km north, then turns left and travels 40 km. He then turns right and travels another 30 km. How far is he from his starting point?
- 50.6 km
- 80.6 km
- 70.6 km
- None of these
Explanation
Step 1: Go 40 km North
Step 2: Turn left and go 40 km West
Step 3: Turn right and go 30 km North
Now make coordinates:
Starting point = (0, 0)
After step 1 = (0, 40)
After step 2 = (-40, 40)
After step 3 = (-40, 70)
Distance from start to end = sqrt[ (x)^2 + (y)^2 ]
= sqrt[ (-40)^2 + (70)^2 ]
= sqrt[ 1600 + 4900 ]
= sqrt[ 6500 ]
= 80.62 km
Approx distance = 80.6 km
Last verified on 12-07-2026
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