Subject
Quantitative Aptitude
Topic
Speed & Distance
Two trains of length 140 meters and 166 meters are moving towards each other on parallel tracks at a speed of 50 km/hr and 60 km/hr respectively. In what time the trains will cross each other from the moment they meet?
Two trains of length 140 meters and 166 meters are moving towards each other on parallel tracks at a speed of 50 km/hr and 60 km/hr respectively. In what time the trains will cross each other from the moment they meet?
ক)
12 secondsখ)
8 secondsগ)
10 secondsঘ)
14 secondsExplanation
দৈর্ঘ্য, L1 = 140 মিটার দৈর্ঘ্য, L2 = 166 মিটার গতিবেগ, S1 = 50 কিমি/ঘন্টা গতিবেগ, S2 = 60 কিমি/ঘন্টা ট্রেন দুটি একে অপরের দিকে আসার কারণে তাদের আপেক্ষিক গতিবেগ হবে তাদের গতির যোগফল। আপেক্ষিক গতিবেগ (S relative) = S1+S2 = 50 কিমি/ঘন্টা + 60 কিমি/ঘন্টা = 110 কিমি/ঘন্টা। = 550/18 মিটার/সেকেন্ড। ট্রেন দুটি একে অপরকে অতিক্রম করার জন্য মোট যে দূরত্ব অতিক্রম করতে হবে তা হলো তাদের দৈর্ঘ্যের যোগফল। মোট দূরত্ব (D) = L1 +L2 = 140 মিটার + 166 মিটার = 306 মিটার। আমরা জানি, সময় (T) = দূরত্ব (D) / গতিবেগ (S)। T= D/S relative = 306 মিটার / (550/18) মিটার/সেকেন্ড = (306×18)/550 সেকেন্ড = 5508/550 সেকেন্ড ≈ 10.01 সেকেন্ড। সবচেয়ে কাছাকাছি বিকল্পটি হলো 10 সেকেন্ড।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-