if iw as to get a steel or iron dragon slayer task would it be faster if i meleed them with black mask and dragon slayer gloves + 25% atk str bonus

 

i'm 80 attack and 99 strength so i would be hitting close to 50s with whip, i can do 47 atm with just black mask on any slayer monster with +15% prayer

meleeing them is definitely faster than ranging if you use super pots.

 

 

 

On average I do a single iron in 45 seconds.

Dragon slayer gloves give 10% attack only I'm afraid.

 

You could try using piety for 50's.

for iron dragons accuracy is probably rather important since their defense is high.