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Furkat [3]
4 years ago
11

A jogger runs a mile in 8.92 minutes. 1 mi=1609m; calculate her speed in km/hr

Chemistry
1 answer:
olchik [2.2K]4 years ago
6 0

Answer:

Speed = 3.30 \frac{km}{hr}

Explanation:

Given

Distance = 1 mile

Time = 8.92 minutes

Required

Calculate Speed in km/hr

Speed is calculated as thus;

Speed = \frac{Distance}{Time}

Substitute 1 mile for distance and 8.92 minutes for time

Speed = \frac{1\ mile}{8.92\ minutes}

Convert Miles to Kilometres

If

1\ mile = 1609\ m;

Then

1\ mile = \frac{1609\ km}{1000}

1\ mile = 1.609\ km --- (1)

Convert minutes to hour

1\ minutes = 0.0167\ hour

Multiply both sides by 8.92

8.92 * 1\ minutes = 0.0167\ hour * 8.92

8.92 \ minutes = 0.148964\ hour ---- (2)

By substituting (1) and (2) in Speed = \frac{1\ mile}{8.92\ minutes}, we have

Speed = \frac{1.609\ km}{0.48694\ hour}

Speed = 3.304309 \frac{km}{hr}

Speed = 3.30 \frac{km}{hr} -- Approximated

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