Subject
Quantitative Aptitude
Topic
Speed & Distance
The ratio of speeds of a car, a train and a bus is 5 : 9 : 4. The average speed of the car, the bus and the train is 72 km/hr. What is the average speed of the car and the train together? ( গাড়ী ট্রেন এবং বাসের গতির অনুপাত 5 : 9 : 4 । গাড়ী, বাস এবং ট্রেনের গড় গতিবেগ 72 কি.মি./ঘন্টা । গাড়ী এবং ট্রেনের গড় গতিবেগ কত ? )
The ratio of speeds of a car, a train and a bus is 5 : 9 : 4. The average speed of the car, the bus and the train is 72 km/hr. What is the average speed of the car and the train together? ( গাড়ী ট্রেন এবং বাসের গতির অনুপাত 5 : 9 : 4 । গাড়ী, বাস এবং ট্রেনের গড় গতিবেগ 72 কি.মি./ঘন্টা । গাড়ী এবং ট্রেনের গড় গতিবেগ কত ? )
ক)
78 km/hrখ)
82 km/hrগ)
84 km/hrঘ)
96 km/hrExplanation
ধরি, গাড়ী, ট্রেন এবং বাসের গতি যথাক্রমে 5x, 9x এবং 4x km/hr ∴ গড় গতি = {(5x+9x+4x)/3} = (18x/3) = 6x km/hr আবার, দেওয়া আছে গড়গতি = 72 km/hr ∴ 6x = 72 => x = 12 km/hr ∴ গাড়ী গতি = 5x = (5×12) = 60 km/hr ট্রেনের গতি = 9x = (9×12) = 108 km/hr সুতরাং, গাড়ী এবং ট্রেনের একত্রে গড় গতিবেগ = {(60+108)/2} = (168/2) = 84 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-