Some telegraph poles are placed 20 m apart. how many poles will a train pass in 3- hours at 60km/h ?
a.1200
b.2500
c.4000
d.9000
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D) 9000
60 × 3 = 180 km
(180 ÷20) × 1000 = 9000 poles
60 × 3 = 180 km
(180 ÷20) × 1000 = 9000 poles
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