Question

A boy covers a distance of 55 miles in 86400 second, find his speed in kilometre per hour?
Please answer my question.​

Answer 1

Answer:

3.67 km/h

Step-by-step explanation:

1 mile = 1.6 km

55 miles = 55 * 1.6 = 88 km

Distance = 88 km

1 hr = 3600 sec

86400 sec = 86400 ÷ 3600 = 24 hr

Time = 24 hr

Speed = $\frac{Distance}{Time}$ = $\frac{88}{24}$ = 3.67 km/h

Answer 2

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$\gray{\bf{\underline{\underline{\bigstar\bigstar\: Solution : }}}}$

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$\footnotesize{ 1 second = \dfrac{1}{60} minutes }$

$\footnotesize{\implies 86400 second = \dfrac{86400}{60} minutes }$

$\footnotesize{\implies 86400 second = \cancel{\dfrac{86400}{60}} minutes }$

$\footnotesize{\implies 86400 second = 1440 \: minutes }$

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$\rule{200}3$

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$\footnotesize{ 1 \: minutes = \dfrac{1}{60} \: hours }$

$\footnotesize{\implies 1440\: minutes = \dfrac{1440}{60} \: hours }$

$\footnotesize{\implies 1440\: minutes = \cancel{\dfrac{1440}{60}} \: hours }$

$\footnotesize{\implies 1440\: minutes = 24 \:hours }$

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$\rule{200}3$

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$\footnotesize{ Total \: time \: taken = 24 \: hours }$

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$\rule{200}3$

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$\footnotesize{ 1 \: mile = 1.609344 \: km }$

$\footnotesize{\implies 55 \: mile = 1.60 \times 55 \: km }$

$\footnotesize{\implies 55 \: mile = 88.51 \: km }$

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$\rule{200}3$

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$\footnotesize{ Total \: distance \: travelled = 88.51 \: km }$

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$\rule{200}3$

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$\footnotesize{ Speed = \dfrac{distance}{time} }$

$\footnotesize{\implies Speed = \dfrac{88.51 \: km}{ 24 \: hours} }$

$\footnotesize{\implies Speed = \cancel{\dfrac{88.51 \: km}{ 24 \: hours}} }$

$\footnotesize{\implies Speed = 3.68 km / h}$