Angular pipe hour and minute format [duplicate]

How can you pipe a number in Angular that comes in minutes, like 450 to look like this 07:30:00 in hours. I only managed to make it look like this 7.5h using the following pipe:

transform(value: number): string {
if(value > 0 && value/60 < 1) {
return value + ' m';

} else {
return value/60 + 'h';
}
}

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