Answer:
I think the answer will be 16 pieces
Step-by-step explanation:
16 x 3/4 will equal 12
The equation to solve for p....[12p = 420]
Then divide both sides by 12.
And your answer....[p = 35]

Hope you could get an idea from here.
Doubt clarification - use comment section.
Answer: 2 and three-fourths (2 3/4)
Step-by-step explanation:
11 * 1/4
1/4 = 0.25
0.25 * 11 = 2.75
.75 = 3/4
2.75 = 2 3/4
They will meet back up in 40 minutes because 8x5=40 and 10x4=40 which 40 is both a multple of 8 and 10 so you're welcome