Distance and Displacement

Study the following information carefully and answer the questions given below.

Mohan starts to walk$10$ Km towards the North then he turns to his left and walks $25$ Km. Again he turns to his right and walks $5$ Km. Finally, he turns towards the East and walks $25$ Km. 

What is the total distance covered by Mohan to reach the last point?

There are three paths from $A$ to $B$ each consists of one or more semi-circles of unknown radii. The path $AXB, AYB, AZB$ are called I, II and III respectively. Which of the following is true?

All the non-zero vectors are called ______.

If radii of two concentric circles are $4 \mathrm{cm}$ and $5 \mathrm{cm}$, then the length of each chord of one circle which is tangent to the other circle is

Read the following information and answer the following question:  

A man is facing South at point A. From there, he turns right and walks $20 \mathrm{m}$, then, he turns right and walks $25 \mathrm{m}$. Then, he turns left and walks $30 \mathrm{m}$ and after turning towards the north, walks $\mathrm{x} \mathrm{m}$. Then, he turns right again and walks $70 \mathrm{m}$ and reaches point B. If the angular position of point B with respect to the point A along vertical axis is $26.5^{\mathrm{o}}$, then find the value of $\mathrm{x}$ (in $\mathrm{m}$).

Cotyledons are also called-