Question

Helen rode 6 km to her aunts house. Her speedometer showed that she had an average of 18km/hr for the whole trip. Calculate the time taken by Helen to reach her aunts house?

Answer 1

Answer:

20min

Step-by-step explanation:

time = dist / speed

= 6 / 18 = 1/3 hr

= 60 / 3 min

= 20 min ...

Answer 2

The time taken by Helen to reach her aunts house = 20 minutes

Given :

Helen rode 6 km to her aunts house.

Her speedometer showed that she had an average of 18km/hr for the whole trip.

To find :

The time taken by Helen to reach her aunts house

Solution :

Step 1 of 2 :

Write down distance and speed

Here it is given that Helen rode 6 km to her aunts house.

Her speedometer showed that she had an average of 18km/hr for the whole trip.

Distance travelled by Helen = 6 km

Speed of Helen = 18 km/hr

Step 2 of 2 :

Calculate time taken by Helen to reach her aunts house

The time taken by Helen to reach her aunts house

$\displaystyle \sf = \frac{Distance \: travelled \: by \: Helen}{Speed \: of \: Helen}$

$\displaystyle \sf = \frac{6}{18} \: \: hour$

$\displaystyle \sf = \frac{1}{3} \: \: hour$

$\displaystyle \sf = \frac{1}{3} \times 60 \: \: minutes\: \: \: \bigg[ \: \because \:1 \: hour = 60 \: minutes \bigg]$

$\displaystyle \sf = 20 \: \: minutes$

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