An absent minded scientist walks on an escalator at a rate of 4 steps per second and reaches the other end in 15 seconds. While coming back, walking at the same speed he reaches the starting point in 45 seconds. What is the number of steps on the escalator?
A. ক 60
B. খ 90
C. গ 150
D. ঘ 120
সঠিক উত্তরঃ
D.
ঘ 120
Explanation:
Related Questions (Any University/Year)
- A machine is producing 800 units per minute. If its productivity falls by a half percent, how many units will it produce now?
- A and B can do a job in 12 days, B and C can do the job in 18 days and A and C can do the job in 9 days. In how many days A alone can finish the work?
- If the radius of a circle is increased by 6% , then the area of the circle is increased by-
- If x and y are integers, 13<x<25 and -2>y>-13, what is the greatest possible value of (x -y)?
- Of the 400 students in a business school, 30% were women and of these 1/5th became entrepreneurs. If the number of men who became entrepreneurs was twice the number of women entrepreneurs, how many men became entrepreneurs?
- Seats for Math, Physics, Biology ratio 5:7:8. Increase by 40%, 50%, 75%. New ratio?
- কঃখ =৩ঃ৫, খঃগ =৪ঃ৭, হলে, কঃগ = কত?
- A woman was thirty years old when her daughter was born. Her age is now 6 years more than three times her daughter’s age. How old will be the daughter in 5 years?
- The missing number in the bracket 21 (9) 12, 24 (?) 9 is
- n denotes the number obtained when n is rounded to the nearest tenth. For example 4.31=4.3 0.089-1.135=
- If Tk. 45,000 was invested in share when the price per share was TK. 90 and TK. 30,000 was invested when the price per share was TK. 60, what was the average price per share purchased ?
- If -4 <x< 12 and -2 < y < 13 which of the following numbers represent the of maximum value (y-x)?'
- At Veridux Corporation, there are 250 employees,of these ,90 are female,and the rest are males.there are total of 40 managers ,and the rest of the employees are associates.If there are a total of 135 male associates,how many female managers are there?
- শতকরা বার্ষিক কতটাকা সুদে ৫০০০ টাকার ৪ বছরের সুদ ২০০০ টাকা হবে?
- if one half of female students enjoy watching movies and one-third of male students do not like to watch movies, what frictional part of the student body enjoys watching movies?
- Point B is on the line segment AC. Which of the following is always true?
- From 1 to 30, how many are the basic numbers?
- In a kilometer race, A beats B by 50 meters or 10 seconds. What time does A take to complete the race?
- If (a+b+c)/4= (a+b)/3, then what is the value of c?
- A bookstore lists a novel at such a price that after giving a discount of 30% on the listed price (including tax) it earns a profit of 40%. If enlisted price of the novel including tax is Tk. 460, then what is the cost price of the novel?