Reena climbs up 6 stairs every second and climbs down 3 stairs over the next second. How many seconds will she take to climb 24 stairs?

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Solution

$Reena climbs 6 steps in 1 \sec and climbs down 3 steps in next 1 \sec so net climb up in 2 \sec = 6 - 3 = 3 steps so to climb 18 steps she will take \Rightarrow \frac{18}{3} \times 2 = 12 \sec now in next 1 \sec she will climb 6 steps 18 + 6 = 24 steps and time = 12 + 1 = 13 \sec$

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Reena climbs up 6 stairs every second and climbs down 3 stairs over the next second. How many seconds will she take to climb 24 stairs?

Reena climbs 6 steps in 1 secand climbs down 3 steps in next 1 secso net climb up in 2 sec=6-3=3 stepsso to climb 18 steps she will take⇒183×2=12secnow in next 1 sec she will climb 6 steps 18+6=24steps and time=12+1=13 sec

$Reena climbs 6 steps in 1 \sec and climbs down 3 steps in next 1 \sec so net climb up in 2 \sec = 6 - 3 = 3 steps so to climb 18 steps she will take \Rightarrow \frac{18}{3} \times 2 = 12 \sec now in next 1 \sec she will climb 6 steps 18 + 6 = 24 steps and time = 12 + 1 = 13 \sec$