Subject
Quantitative Aptitude
Topic
Speed & Distance
A boat travels at 20 kmph in still water. It covers 30 km downstream in 1 hour. How long will it take to travel 45 km upstream?
A boat travels at 20 kmph in still water. It covers 30 km downstream in 1 hour. How long will it take to travel 45 km upstream?
ক)
3 hoursখ)
4.5 hoursগ)
5 hoursঘ)
6 hoursExplanation
নৌকার গতি স্থির পানিতে = 20 kmph ভাটিতে 30 km দূরত্ব অতিক্রম করতে সময় লাগে = 1 ঘন্টা ভাটিতে গতি = নৌকার গতি + স্রোতের গতি = 30 kmph (ভাটিতে গতি) সুতরাং, 30 = 20 + স্রোতের গতি স্রোতের গতি = 30 - 20 = 10 kmph স্রোতের বিপরীতে গতি = নৌকার গতি - স্রোতের গতি = 20 - 10 = 10 kmph সময় = দূরত্ব ÷ গতি = 45 km ÷ 10 kmph = 4.5 ঘন্টাRelated 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-