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)
- ১,০০০ টাকা ক ও খ ১ঃ ৪ অনুপাতে ভাগ করে নেয়। খ এর অংশ সে এবং তার মা ও মেয়ের মধ্যে ২ঃ ১ঃ ১ অনুপাতে ভাগ করে। মেয়ে কত টাকা পাবে?
- How many squares with sides-inch long are needed to cover a rectangle that is 4 feet long and 6 feet wide?
- A এবং B একটি কাজ ৮ ঘন্টায় সম্পন্ন করতে পারে। C এবং D একই কাজ ১২ ঘন্টায় সম্পন্ন করতে পারে। যদি চারজন একই সাথে কাজ করে, তাহলে উক্ত কাজটি সম্পন্ন করতে আনুমানিক কত সময় লাগবে?
- In a class of 78 students 41 are taking French, 22 are taking German. One of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course?
- ঢাকা-আরিচা বাসে প্রথম 4 কিমি ভ্রমনের ভাড়া 10.00 টাকা, পরবর্তী 20 কিমি পর্যন্ত প্রতি কিলোমিটারের ভাড়া ৯০ পয়সা এবং পরবর্তী প্রতি কিলোমিটারের ভাড়া 70 পয়সা। 25 কিমি দূরত্বে ভ্রমনের ভাড়া কত?
- Of the following the closet approximation to V(5.98×601.5/15.79)
- What is the smallest positive integer K such that the product 1575 x K is a perfect square?
- A discount of 20 percent on an order of goods followed by a discount of 10 percent amounts to
- If Milly gives Tilly Tk. 60 , the money they have is in the ratio 2:1 however , If Tilly gives Mily TA. 10 the ratio is 1:3 How much money have Milly before they exchange any money?
- A room at Zaber Hotel International can accommodate 4 people. The rate is 3900 one person and Tk. X for each additional people. If 3 people take the room for one night and pays Tk. 2100 per person, what is the value of X?
- If \(x/z\) is more than \(y/z\), then \(y = ?\)
- 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?
- The average weekly salary per head of all employees is Tk. 1000 (Supervisors and Labours). The average weekly per head salary of all supervisors is Tk. 6000 while the average weekly salary per head of all labours is Tk. 750. If there are 840 labours in it find the number of supervisors
- The total weight of a tin and the cookies it contains is 2 Pounds. After 3/4 of the cookies are eaten, the tin and the remaining cookies weight 0.8 Pounds. What is the weight of the empty tim in pounds.
- Sonia travels to IBA from Uttara by car at a speed of 40 km per hour and returns to Uttara at a speed of 30 km per hour by an auto rickshaw. What is her average speed in the entire journey in km/hour?
- Lima is 6 years older than her sister Sharmin, and Jamal is 5 years older than Lima. If the total of their ages is 41, how old is Jamal?
- ১ হতে ২০ পর্যন্ত বিজোড় সংখ্যা গুলোর গড় কত ?
- The total age of A and B is 12 years more than the total age of B and C .C is how many years younger than A?
- Of a group of people surveyed in a political poll, 60 percent said that they would vote for candidate R. Of those who said they would vote for R. 90 percent actually voted for R. and of those who did not say that they would vote for R. 5 percent actually voted for R. What percent of the group voted for R?
- If a 60 ml of water contains 20% of chlorine, how much water must be added in order to create a 12.5% chlorine solution?