Question

in a 100 m race, ram runs at a speed of 12km/h leaving shyam 5m behind. What was shyam's speed?

Answer 1

If Ram is covering 60m in 5 seconds according to the given information.....

There fore Shyam is covering 60-5=55m

in the same time ....

speed=DISTANCE/TIME

55/5=11M/S (ANSWER)

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Answer 2

The speed of Shyam would be 11.4 km/h

Step-by-step explanation:

Given,

The speed of Ram = 12 km/h,

∵ 1 km = 1000 meters,

1 hour = 3600 seconds,

$\implies \frac{\text{ 1 km}}{\text{ 1 second}}=\frac{1000}{3600}=\frac{5}{18}\text{ meter per sec}$

So, the speed of Ram = $12\times \frac{5}{18}=\frac{60}{18}=\frac{10}{3}\text{ meter per sec}$

Distance of race = 100 meters,

Thus, time taken by Ram = $\frac{Distance}{Speed}=\frac{{100}}{\frac{10}{3}}=30\text{ sec}$

Now, in a race the time is allotted equally,

i.e. time taken by Shyam = 30 sec,

∵ Shyam is 5 meters behind Ram,

Distance covered by Shyam = 100 - 5 = 95 meters,

Hence, Shyam's speed = $\frac{95}{30}$ meter per sec,

$=\frac{95}{30}\times \frac{18}{5}$  km per hour,

$=\frac{19\times 6}{10}$ km per hour,

= 11.4 km per hour

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