Step-by-step explanation:
Train crosses an electric pole in 5 sectime to crosses the tunnel = 20 secformula used :speed = distance / time Calculation :The length of the tunnel be x m and the length of the best be y m
Time = distance / speed 5 = ( y / 90) y = 450 mTime to crosse the tunnel = Distance / Speed
20= ( y + x ) / 90 20 × 90 = ( 450 + x ) x = 1800 - 450 = 1350 The length of the tunnel is 1350 plz mark me as briliant :)
Author:
zacherybf81
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