Question

Sushila is walking at a constant speed of
4.2 km/h. How much distance will she cover
in 40 minutes?
Please explain briefly
With formula
​

Answer 1

Answer:

4 kilometres is the correct answer

Answer 2

Answer:

2.8 km

Explanation:

As per the provided information in the given question, we have:

• Speed of Sushila = 4.2 km/h
• Time taken by her = 40 minutes

We are asked to calculate how much distance will she cover in 40 minutes.

Let us assume the distance will she cover in 40 minutes as s.

Before commencing the steps, it is necessary to convert the given time into hours.

→ 1 hour = 60 minutes

→ 1 minute = $\sf \dfrac{1}{60}$ hr

→ 40 minutes = $\sf{ \cancel{\dfrac{40}{60}}}$ hr

→ 40 minutes = $\sf \dfrac{2}{3}$ hr

Now, as it is known to us that,

$\longrightarrow \boxed{\sf { s = v \times t}}$

• s denotes distance
• v denotes speed
• t denotes time

$\longrightarrow \sf { s = \Bigg ( 4.2 \times \dfrac{2}{3} \Bigg ) \; km}$

Removing decimal from 4.2 and putting 10 into the denominator.

$\longrightarrow \sf { s = \Bigg ( \dfrac{\cancel{42}}{10} \times \dfrac{2}{\cancel{3}} \Bigg ) \; km}$

$\longrightarrow \sf { s = \Bigg ( \dfrac{14}{\cancel{10}} \times \dfrac{\cancel{2}}{1} \Bigg ) \; km}$

$\longrightarrow \sf { s = \Bigg ( \dfrac{14}{5} \times \dfrac{1}{1} \Bigg ) \; km}$

$\longrightarrow \underline{\boxed{ \sf { s = 2.8 \; km}}}\; \bigstar$

$\therefore$ Distance covered by her in 40 minutes is 2.8 km.

★ Some extra information :

• Distance is the length total path covered by the body.

• Distance is a scalar quantity, that means it has only magnitude.

• SI unit of distance is metre (m).

• Distance is denoted by 's'.

• Distance = Speed × Time