RRB Group-D Model Paper 19 with answers for online practice

Given:
3 tailors stitch a PPE suit in 45 hours
Formula used:
M1 × H1/W1 = M2 × H2/W2, where, M is number of workers, H is number of hours and W is work done
Calculation:
Let required number of hours be ‘H”
According to question:
3 × 45 × 1/1 = 15 × H × 1/8
⇒ H = 9 × 8 = 72 hours