Subject
Quantitative Aptitude
Topic
Speed & Distance
The speeds of A and B are in the ratio 3 : 4 : . A takes 20 minutes more than B to reach a destination. In what time does A reach the destination?(A এবং B এর গতির অনুপাত 3 : 4 . একটি দূরত্ব অতিক্রম করতে B থেকে A এর 20 মিনিট সময় বেশি লাগে । A এর গন্তব্যে যেতে কত সময় লাগবে?)
The speeds of A and B are in the ratio 3 : 4 : . A takes 20 minutes more than B to reach a destination. In what time does A reach the destination?(A এবং B এর গতির অনুপাত 3 : 4 . একটি দূরত্ব অতিক্রম করতে B থেকে A এর 20 মিনিট সময় বেশি লাগে । A এর গন্তব্যে যেতে কত সময় লাগবে?)
ক)
1(1/3)hoursখ)
1(2/3)hoursগ)
2 hoursঘ)
2(2/3)hoursExplanation
A এবং B এর গতির অনুপাত 3 : 4 সুতরাং, একই দূরত্ব অতিক্রম করতে সময়ের অনুপাত = (1/3) : (1/4) [ যেহেতু, গতি=দূরত্ব/সময়; অর্থাৎ, {গতি×(1/সময়)}] ধরি, A এর গন্তব্যে যেতে সময় লাগে 4x মিনিট এবং B এর লাগে 3x মিনিট । ∴ 4x - 3x = 20 => x = 20 ∴ A এর গন্তব্যে যেতে সময় লাগে 4x = 4×20 = (80/60) ঘন্টা = 80 মিনিট = 1 (1/3) 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-