Subject
Quantitative Aptitude
Topic
Speed & Distance
A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr, and the last one-third distance with a 60 km/hr. The average speed of the car for the whole journey is (একটি গাড়ি একটা নির্দিষ্ট দূরত্বের প্রথম এক-তৃতীয়াংশ 10 km/hr গতিতে, পরের এক-তৃতীয়াংশ 20 km/hr গতিতে এবং শেষ এক-তৃতীয়াংশ 60 km/hr অতিক্রম করে । পুরো ভ্রমণে গাড়িটির গড় কত ?)
A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr, and the last one-third distance with a 60 km/hr. The average speed of the car for the whole journey is (একটি গাড়ি একটা নির্দিষ্ট দূরত্বের প্রথম এক-তৃতীয়াংশ 10 km/hr গতিতে, পরের এক-তৃতীয়াংশ 20 km/hr গতিতে এবং শেষ এক-তৃতীয়াংশ 60 km/hr অতিক্রম করে । পুরো ভ্রমণে গাড়িটির গড় কত ?)
ক)
18 km/hrখ)
24 km/hrগ)
30 km/hrঘ)
36 km/hrExplanation
প্রতিটি সমান দূরত্বে কারের বেগ যথাক্রমে x km/hr, y km/hr , z km/hr x = 10 km/hr y = 20 km/hr z = 60 km/hr 77নং এর সমাধান অনুযায়ী, গড় বেগ = {3xyz/(xy+yz+zx)} [ তিনটি বেগ দেয়া থাকলে এই সূত্র প্রযোজ্য] =[ {(3×10×20×60)}/{(10×20)+(20×60)+(60×10)} ] km/hr = 18 km/hrRelated questions
A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:Speed of a boat in standing water is 9 kmph and the speed of the stream is 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1/10 km and 9 km respectively. The time taken by slower train to cross the faster train in seconds is -A man can row three-quarters of a kilometre against the stream in 11×(1/4) minutes and down the stream in 7×(1/2) minutes. The speed (in km/hr) of the man in still water is:In a 300 m race A beats B by 5 metre or 6 seconds. B's time over the course is -A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?A boat covers a certain distance downstream in 1 hour, while it comes back in 1x(1/2) hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?A man buys tk 20 shares paying 9% dividend. The man wants to have an interest of 12% on his money. The market value of each share is-