Subject
Quantitative Aptitude
Topic
Speed & Distance
A boat sailing against the current takes 8 hours to travel 32 km. If it had been sailing with the current the time taken would have been only 4 hours. What is the speed of current?
A boat sailing against the current takes 8 hours to travel 32 km. If it had been sailing with the current the time taken would have been only 4 hours. What is the speed of current?
ক)
3 km/hrখ)
2.5 km/hrগ)
2 km/hrঘ)
1 km/hrঙ)
None of theseExplanation
QUESTION : একটি boat স্রোতের বিপরীতে 32 km যেতে 8 ঘণ্টা সময় নেয়। যদি এটি স্রোতের অনুকূলে যেত, তাহলে মাত্র 4 ঘণ্টা সময় লাগত। স্রোতের গতি কত? সমাধান: *ধরি, boat-এর নিজস্ব গতি = x km/hr এবং স্রোতের গতি = y km/hr *স্রোতের বিপরীতে: (x - y) × 8 = 32 -স্রোতের অনুকূলে: (x + y) × 4 = 32 *সমীকরণ থেকে পাই: -x - y = 4 এবং x + y = 8 *দুটি সমীকরণ যোগ করে: -2x = 12 -x = 6 *x এর মান বসিয়ে: -6 - y = 4 -y = 2 -সুতরাং, স্রোতের গতি 2 km/hr। সঠিক উত্তর: (C) 2 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-