Every floor of $25$ storey building is $5 m$ high. If a lift moves $2$ metres every second, how long will it take to move from $3 r d$ floor to $15 t h$ floor?

32

seconds

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40

seconds

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30

seconds

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25

seconds

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Solution

The correct option is C $30$ seconds
Height of $1 f l o o r = 5 m$
Number of floor from $3^{r d} t o 15^{t h} = 12$
$∴$ Total distance $= 12 \times 5 = 60 m$
Time taken to cover $2 m = 1$ sec
$∴$ Time taken to cover $60 m = \frac{60}{2}$ $= 30$ seconds

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Every floor of 25 storey building is 5m high. If a lift moves 2 metres every second, how long will it take to move from 3rd floor to 15th floor?

The correct option is C 30 secondsHeight of 1floor=5mNumber of floor from 3rdto15th=12∴ Total distance =12×5=60mTime taken to cover 2m=1 sec∴ Time taken to cover 60m=602 =30 seconds

Every floor of $25$ storey building is $5 m$ high. If a lift moves $2$ metres every second, how long will it take to move from $3 r d$ floor to $15 t h$ floor?

The correct option is C $30$ seconds
Height of $1 f l o o r = 5 m$
Number of floor from $3^{r d} t o 15^{t h} = 12$
$∴$ Total distance $= 12 \times 5 = 60 m$
Time taken to cover $2 m = 1$ sec
$∴$ Time taken to cover $60 m = \frac{60}{2}$ $= 30$ seconds