Answer :
30=x/2 where x is time -- multiply by 2
x=60 One pump would take 60h to fill it up.
60/5=12 It would take 12 hours for 5 pumps.
x=60 One pump would take 60h to fill it up.
60/5=12 It would take 12 hours for 5 pumps.
30x2=60 (to find one pump)
60/5=12
It would take 12 hours so it would be quicker by 18 hours
60/5=12
It would take 12 hours so it would be quicker by 18 hours