Convert Hours into Seconds in JavaScript

Write a function that converts hours into seconds.
 
Examples:
howManySeconds(2) ➞ 7200
howManySeconds(10) ➞ 36000
howManySeconds(24) ➞ 86400
Notes:
   60 seconds in a minute, 60 minutes in an hour
 
<script>
function howManySeconds(hour){
var seconds = hour * 60 * 60 *;
}
 
var hour = 2;
console.log(howManySeconds(hour)); /// this will print 7200 in console.
 
</script>