Question

The odometer of a car reads 3000 km
at the start of a trip and 3400 at the
end of the trip. It the trip took 8 h,
calculate the average speed of the
car in ms -1
RRB Group D 2018
(1) 13.9 ms 42712.9 ms
(3) 14.9 ms -1 (4) 15.9 ms​

Answer 1

$\huge\sf\pink{Answer}$

☞ Average Speed = 13.9 m/s

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$\huge\sf\blue{Given}$

✭ Initial Distance = 3000 km

✭ Final Distance = 3400 Km

✭ Time Taken = 8 Hours

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$\huge\sf\gray{To \:Find}$

◈ The Average Speed (m/s)?

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$\huge\sf\purple{Steps}$

So here the Distance travelled is,

➢ $\sf Final \ Distance - Initial \ Distance$

➢ $\sf 3400 - 3000$

➢ $\sf D = 400 \ Km$

So how we know that Average Speed is given by,

$\underline{\boxed{\sf Avg \ Speed = \dfrac{Total \ Distance}{Total \ Time}}}$

Substituting the given values,

➳ $\sf Avg \ Speed = \dfrac{400 \times 1000}{8\times60\times 60 }$

➳ $\sf\orange{Avg \ Speed = 13.9 \ m/s}$

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