Question

One of the fastest recorded speeds of the elephant is 6.9 m/s. Approximately, what is this speed in kilometers per hour? [1 kilometer = 1,000 meters] [1 hour = 60 minutes = 3,600 seconds]

Answer 1

To answer this question, we know that 1km equals 1000m

and 1 hour is equal to 60 minutes. In the same way 1 minute equals 60 sec onds

So we have to change the units of elephant speed to km per hour.

For this we do the following procedure:

1) we multiply 6.9 m / s by the conversion factor from meters to kilometers (1 km / 1000m)

$6.9 \frac{m}{s} *\frac{1 km}{1000 m}=0.0069\frac{km}{s}$

2) The result obtained is multiplied by the conversion factor from seconds to minutes (60s / 1min)

$0.0069 \frac{km}{s} *\frac{60 s}{1 min}=0.414 \frac{km}{min}$

3) The result obtained is multiplied by the conversion factor from minutes to hours (60min / 1hr)

$0.414\frac{km}{min}*\frac{60 min}{1 h}= 24.84\frac{km}{h}$

The answer is 24.84 km / h

 

 You can skip step 2) multiplying 0.0069 km / s by the conversion factor from seconds to hours (3600 s / 1h)