Question

A car travels 420 2/5 km in 4 hours. Find its speed.​

Answer 1

Answer:

$= \frac{2}{5} = 0.40$

$= \frac{420.40}{4} = 15.10 = answer$

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Given:

Distance = 420 = 2/5km

Time = 4 hours = 1/5 hour

To find

the speed

Solution:

As we all know

$Speed\:=\:\frac{Distance}{Time}$

$Speed\:=\:\frac{2}{5}\div \frac{1}{5}$

$\mathrm{Apply\:the\:fraction\:rule}:\quad \frac{\frac{a}{b}}{\frac{c}{d}}=\frac{a\cdot \:d}{b\cdot \:c}$

$=\frac{2\cdot \:5}{5\cdot \:1}$

$\mathrm{Apply\:rule}\:a\cdot 1=a$

$=\frac{2\cdot \:5}{5}$

$\mathrm{Multiply\:the\:numbers:}\:2\cdot \:5=10$

$=\frac{10}{5}$

$\mathrm{Divide\:the\:numbers:}\:\frac{10}{5}=2$

$=2\mathrm{kmph}$