"bolehkah mereka......." should be accepted.
"bolehkah mereka..." is now accepted.
I was wondering whether there is a strict equivalence between "bolehkah mereka..." and "apakah mereka boleh...", or is there a subtle nuance which I don't get yet ?
I don't think there's any difference between those sentences
My answer: Apakah mereka diizinkan untuk mempercepat atau memperlambat kecepatan mereka?
How can it be wrong?
best option is to report the error i guess
I think velocity should just be speed here.