Subject
Quantitative Aptitude
Topic
Speed & Distance
A person travels equal distance with speeds of 3 km/hr, 4 km/hr and 5 km/hr and takes a total time of 47 minutes . The total distance (in km ) is ( একজন ব্যক্তি সমান দূরত্ব, ঘন্টায় 3, 4 ও 5 কি.মি. বেগে অতিক্রম করল এবং এতে যদি 47 মিনিট সময় লাগে তাহলে মোট দূরত্ব কত ?)
A person travels equal distance with speeds of 3 km/hr, 4 km/hr and 5 km/hr and takes a total time of 47 minutes . The total distance (in km ) is ( একজন ব্যক্তি সমান দূরত্ব, ঘন্টায় 3, 4 ও 5 কি.মি. বেগে অতিক্রম করল এবং এতে যদি 47 মিনিট সময় লাগে তাহলে মোট দূরত্ব কত ?)
ক)
2খ)
3গ)
4ঘ)
5Explanation
ধরি, প্রতিক্ষেত্রে সমান x km দূরত্ব অতিক্রম করে মোট দূরত্ব = x + x + x = 3x দূরত্ব(কি.মি.) বেগ(কি.মি./ঘন্টা) সময়=(দূরত্ব/বেগ)(ঘন্টা) x 3 (x/3) x 4 (x/4) x 5 (x/5) মোট সময় = 47 মিনিট = (47/60) ঘন্টা শর্তমতে, মোট সময়, {(x/3)+(x/4)+(x/5)} = 47/60 => {(20x+15x+12x)/60} = 47/60 => (47/60)x = 47/60 ∴ x = 1 কি.মি. মোট দূরত্ব = 3x = 3 × 1 = 3 কি.মি.Related 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-