Subject
Quantitative Aptitude
Topic
Speed & Distance
Walking (/7)th his usual speed, a man is 12 minutes too late. The usual time taken by him to cover that distance is ( নিজস্ব গতির (6/7) অংশ গতিতে চললে, একজন ব্যক্তির 12 মিনিট বিলম্ব হয় । নিজস্ব গতিতে ঐ দূরত্ব অতিক্রম করতে তাঁর কত সময় লাগবে?)
Walking (/7)th his usual speed, a man is 12 minutes too late. The usual time taken by him to cover that distance is ( নিজস্ব গতির (6/7) অংশ গতিতে চললে, একজন ব্যক্তির 12 মিনিট বিলম্ব হয় । নিজস্ব গতিতে ঐ দূরত্ব অতিক্রম করতে তাঁর কত সময় লাগবে?)
ক)
1 hourখ)
1 hr 12 minগ)
1 hr 15 minঘ)
1 hr 20 minExplanation
ধরি, নিজস্ব বেগ x km/hr এ যেতে t ঘন্টা সময় লাগে ∴ (6/7)x km/hr বেগে যেতে সময় লাগে {t + (12/60)} ঘন্টা = {t +(1/5)} ঘন্টা ∴ দূরত্ব = xt = [(6/7)x {t+(1/5)}] => t = (6/7)t + (6/35) => (1/7)t = (6/35) => t = (6/5) ঘন্টা = {1 + (1/5)} ঘন্টা = 1 ঘন্টা + {(1/5)×60} মিনিট = 1 ঘন্টা 12 মিনিটRelated 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-