Question

12. A student runs 200 metres in 40 seconds. Find his speed in km/h. His friend runs at 15 km/h. Find the ratio of their speeds.​

Answer 1

Answer:

30:15/3.

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Answer 2

Answer:

• speed in km/hr = 18
• ratio = 6/5 = 1.2

Step-by-step explanation:

Given :-

• A student runs 200 metres in 40 seconds

Solution :-

$speed \: = \frac{distance}{time}$

putting values of distance and time , we get speed in m/sec.

$speed \: = \frac{200 \: m}{40 \: sec}$

$speed \: = 5 \frac{m}{sec}$

converting m/sec into km/hr

$5 \frac{m}{sec} = \frac{5 \times 60 \times 60}{1000} \frac{km}{hr} = 18 \frac{km}{hr}$

Speed in km/hr = 18 km/hr

• His friend runs at 15 km/hr

Therefore,

Ratio of their speed =

$\frac{speed \: of \: student}{speed \: of \: his \: friend} = \frac{18}{15} = \frac{6}{5} = 1.2$

Ratio of the student's speed to his friend's speed = 1.2