Question

A tortoise moves a distance of $100$ meters in $15$ minutes. What is the average speed of the tortoise in $km/h$ ?

Answer 1

Hint: First, we will need to know about the formula of speed, distance, and time. After that, we will convert the given meters to kilometers, and also, we will convert the given minutes to hours because the required answer only needs to be in the form of $km/h$. So that only we are converting otherwise which is not necessary to convert.

Complete step-by-step solution:
Since from the given that a tortoise will be moving at the distance of $100$ meters in $15$ minutes.
This means the distance covered is given as $100$ meters and as we know the formula to convert meters into kilometers is $1km = 1000m$. Now divide by sides with the number $10$ then we get $100m = 0.1km$ and thus which is then converted to kilometer value.
Similarly, the total time taken to cover the distance is given as $15$ minutes, now we will convert this into hours. The conversion of the minutes to hours is given formula as $1h = 60\min s$ and hence divide both sides with the number $4$ then we get $15\min s = 0.25h$
Thus, we have the distance covered is $0.1km$ and then the total time taken is $0.25h$
Hence the distance and time are known things here and the formula to find the unknown speed is given as $S = \dfrac{D}{T}$ where S is the speed that we need to calculate, D is the distance covered and T is the total time taken to cover the distance.
Hence substituting the values, we get $S = \dfrac{D}{T} = \dfrac{{0.1}}{{0.25}}$ and thus by division operation we get $S = \dfrac{D}{T} = 0.4km/h$
Therefore, the average speed of tortoise $km/h$ is $0.4$

Note: Since in the given question, they ask us to find the speed and they themselves are given the values of the distance and time.
Suppose they given the value of the distance and speed than the formula to calculate the unknown time is $T = \dfrac{D}{S}$
Suppose they have given the value of the speed and time and the formula to calculate the unknown distance is $D = T \times S$
Hence it will only depend on the given question.