Answer :
1) Total distance =3+ 4 + 9 = 16 Km
2) Total displacement = 12.6 km
The net displacement in east direction is 3+9=12 km
The net displacement in north direction is 4 km
The net displacement in south and west direction is zero
Using, pythagorean theorem
displacement(d)=√(122+ 42)=√(144+16)=√(160)=12.6 km
Hence, The displacement of body is 12.6 km in north-east direction
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