**Definitions:**

**Hour** (abbreviations: **hr, or h**): is a unit of time, conventionally counted as 1/24 of a day. In the modern metric system, it is equivalent to 3,600 seconds.

**Second** (abbreviations: **sec, or s, or s (SI), or sec (US)**): is the base unit of time in the International System of Units (SI, Système International d'Unités). It is the second division of the hour by sixty, where the first division by sixty being the minute.

## How to Convert Hours to Seconds

*Example: How many seconds are equivalent to 3.21 hours?*

As;

1 hours = 3600 seconds

3.21 hours = Y seconds

Assuming Y is the answer, and by criss-cross principle;

Y equals 3.21 times 3600 over 1

(i.e.) Y = 3.21 * 3600 / 1 = 11556 seconds

Answer is: 11556 seconds are equivalent to 3.21 hours.

*Practice Question: Convert the following units into sec:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 53.76 hr

( ii ) 62.66 hr

( iii ) 70.01 hr