Rehaan climbs 5 stairs every second and then climbs down 2 stairs over the next second. how many seconds will she take to climb 60 stairs.
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Please give me the answer!!
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Rehaan climbs 5 stairs every second and then climbs down 2 stairs over the next second. how many seconds will she take to climb 60 stairs.
Ans =
Please give me the answer!!
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Verified answer
Answer:
40 seconds
Step-by-step explanation:
U = +5 stairs/second
D = -2 stairs/second
Net stairs in 2 seconds = 3 stairs
2 seconds ----------- 3 stairs
36 seconds --------- 54 stairs (multiplied by 18 both sides)
37 seconds --------- 59 stairs (+5 stairs)
38 seconds --------- 57 stairs (-2 stairs)
39 seconds --------- 62 stairs (+5 stairs)
40 seconds --------- 60 stairs (-2 stairs)
Step-by-step explanation:
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