60. The elevator in an eleven - storied office building travels at the rate of one floor per $\frac{1}{4}$ minute, which allows time for picking up and letting down passengers. At the main floor and at the top floor the operator stops for 1 minute. How many complete (return) trips will the operator makes during a 7 hour period?

Answer: B) 60

A) 50
B) 60
C) 80
D) None

Explanation

B) 60. An eleven-storey building has 10 gaps between floors. At $\frac{1}{4}$ minute per floor, one way takes 2.5 minutes. A return trip is 2.5 minutes up, a 1-minute stop at the top, 2.5 minutes down and a 1-minute stop at the main floor: 7 minutes in all. Seven hours is 420 minutes, and 420 ÷ 7 = 60.

Asked in: Petrobangla 2016

Topic: Arithmetic

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একটি পাত্রে দুধ ও পানির অনুপাত ৫ : ১। দুধের পরিমাণ যদি পানি অপেক্ষা ৮ লিটার বেশি হয় তবে পানির পরিমাণ কত?
A student's marks were wrongly entered as 83 instead of 63. Due to the error the average marks for the class got increased by 0.5. Find the number of students in the class.
31. Which of the following reasons is responsible for the conflict in rankings of mutually exclusive investment projects?
Mr. Power attends to, on the average, 12 TV service calls per day. Mr. Fixit attends to, on the average, 16 service calls per day. Mr. Power's average is 3/2 as much as that Mr. Fixit, who earns Tk. 7200 per month. The monthly dibi earnings of Mr. Power, in Taka, is:
একটি স্কুলে মোট ৫৪০ জন ছাত্রের মধ্যে কোন এক বুধবারে ২৭ জন অনুপস্থিত ছিল। ঐদিন শতকরা কত জন ছাত্র উপস্থিত ছিল?

Explanation

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