Chapter 2, Problem 57A

To determine

To Calculate: The time elapsed when Person N reaches the bank.

Answer to Problem 57A

  $17.9\text{ min}$

Explanation of Solution

Given:

Jogging speed of Person N, $v=4.0\text{m/s}$

Distance covered from home till bank, $d=4.3\text{km}$

Formula Used:

Time elapsed can be obtained by:

  $t=\frac{d}{v}$

Where, v is the speed and d is the distance covered.

Calculations:

Convert distance from km to m.

  $4.3\text{km}=4.3\times {10}^3\text{m}$

Substitute the values in above formula and solve:

  $\begin{array}{c}t=\frac{4.3\times {10}^3\text{m}}{4.0\text{m/s}}\\ =1075\text{s}\\ \text{=}\frac{\text{1075}}{60}\min \\ \text{=17}\text{.9 min}\end{array}$

Conclusion:

Thus, the time elapsed when Person N reaches the bank from home is $17.9\text{ min}$ .