Nathaniel can weld a railing in 75 minutes. Brenda can weld a railing 25 minutes faster. How many minutes does it take them to weld the railing if they work together?

Time taken by Nathaniel for wielding a railing = 75 minutes

Time taken by Brenda for wielding the same railing = 75 - 25 minutes

= 50 minutes

Time taken by both of them together

to wield the railing = (75 * 50) / (75 + 50)

= 3750/125

= 30 minutes

I hope the procedure is clear enough for you to understand.