The velocity-time graph of a body moving in a straight line is...

Total distance covered in $10 \mathrm{~s}=$ Area $1+$ Area $2+$ Area 3
\\ \Rightarrow $\frac{1}{2} \times$6 $\times$20+$\frac{1}{2} \times$2 $\times$20+$\frac{1}{2} \times$2 $\times$10=90 $\mathrm{~m}$\\ \\ Total displacement in $10 \mathrm{~s}=$ Area $1-$ Area 2 + Area 3 \\ \\ \Rightarrow $\frac{1}{2} \times$6 $\times$20-$\frac{1}{2} \times$2 $\times$20+$\frac{1}{2} \times$2 $\times$10=50 $\mathrm{~m}$\\