Answer:
Step-by-step explanation:
steve gets in the elevator at 11 th floor and stephen floor is not mentioned
so their relative speed = floors covered by both of them in unit time
57+63=120 floors/min
there are 40 floors b/w them b/c steve is at 11th floor and stephen is at 51st floor
so time taken them to meet = 40/120 min =1/3 min=20 sec
so steve will cover S=D/T , Dist.=Speed*Time
Dist.=57*1/3=19
So they will meet at 11+19 = 30 floor
and elevator will cross each other completely at 31st floor
option)E)
let they will cross each other at x th floor .
time taken by Steve to reach xth floor
= (x-11)/57
time taken by Stephen to reach xth floor
= (51-x)/63
(x-11)/57 = (51-x)/63
option (E) none of these
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Verified answer
Answer:
Step-by-step explanation:
steve gets in the elevator at 11 th floor and stephen floor is not mentioned
so their relative speed = floors covered by both of them in unit time
57+63=120 floors/min
there are 40 floors b/w them b/c steve is at 11th floor and stephen is at 51st floor
so time taken them to meet = 40/120 min =1/3 min=20 sec
so steve will cover S=D/T , Dist.=Speed*Time
Dist.=57*1/3=19
So they will meet at 11+19 = 30 floor
and elevator will cross each other completely at 31st floor
Answer:
option)E)
Step-by-step explanation:
let they will cross each other at x th floor .
time taken by Steve to reach xth floor
= (x-11)/57
time taken by Stephen to reach xth floor
= (51-x)/63
(x-11)/57 = (51-x)/63
x = 30
option (E) none of these