RRB Group-D Model Paper 13 with answers for online practice

Given:
2 tailors stitch a PPE suit in 36 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:
2 × 36 × 1/1 = 12 × H × 1 /13
⇒ H = 6 × 13 = 78 hours