A certain physicist, who is always hurry, walks up an on-going escalator at the rate of one step per second. Twenty steps bring him to the top. Next day he goes up at two steps per second, reaching the top 32 steps. How many steps are there in the escalator? A. 80 B. 60 C. 50 70

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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In the population of a certain village there is Zone 1, Zone 2, and Zone 3. The sum of their ages is
2160; the average age is 36; the average age of People in zone 1 and zone 2 is 39; the average
age of zone 1 and zone 3 is 36 and 2/3. If each the people in zone 1 had been 1 year older, each
in Zone 2 6 years and each in zone 37 years older, their average age would have been greater
by 5 years. Find the number of Person in zone 1 and their average ages.
A. 20, average age = 30 ycs
B. 24, average age = 35 yrs
C. 16, average age = 45 yrE
D. 28, average age = 40 yrE
Transcribed Image Text:In the population of a certain village there is Zone 1, Zone 2, and Zone 3. The sum of their ages is 2160; the average age is 36; the average age of People in zone 1 and zone 2 is 39; the average age of zone 1 and zone 3 is 36 and 2/3. If each the people in zone 1 had been 1 year older, each in Zone 2 6 years and each in zone 37 years older, their average age would have been greater by 5 years. Find the number of Person in zone 1 and their average ages. A. 20, average age = 30 ycs B. 24, average age = 35 yrs C. 16, average age = 45 yrE D. 28, average age = 40 yrE
6. A certain physicist, who is always hurry, walks up an on-going escalator at the rate of one step
per second. Twenty steps bring him to the top. Next day he goes up at two steps per second,
reaching the top 32 steps. How many steps are there in the escalator?
A. 80
B. 60
C. 50
D. 70
Transcribed Image Text:6. A certain physicist, who is always hurry, walks up an on-going escalator at the rate of one step per second. Twenty steps bring him to the top. Next day he goes up at two steps per second, reaching the top 32 steps. How many steps are there in the escalator? A. 80 B. 60 C. 50 D. 70
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