Answer:any speed greater than 4.22 m/s
Explanation:
Given
Length of substation =24.5 m
speed of escalator =2 m/s
Time to cross the escalator is 11 s
let v be the speed of boy
Therefore minimum speed to match the record time is
24.5=(v-2)11
v-2=2.22
v=4.22 m/s
Therefore a speed greater than 4.22 m/s is required to beat the record
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