Distance travelled by A in one chance = (6 –1) cm = 5 cm Distance travelled by B in one chance = (7 – 3) cm = 4 cm Distance travelled by C in one chance = (6.5 – 2) cm = 4.5 cm. Hence, Length of pillar A = 5 × 39 + 6 = 201 cm Length of pillar B = 4 × 39 +7 = 163 cm Length of pillar C = 4.5 × 39 + 6.5 = 182 cm Length of shortest pillar → B. 163 cm.