A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/hr, the time taken by it to cover the same distance will be :

A 13 min 20 sec
B 10 min
C 11 min 20 sec
D 13 min

Correct Answer: 13 min 20 sec

Hints: speed of the train = distance / time = 10 / ( 12/60) = 10× 60 / 12 = 50 km/h Now speed = 45 km/h Required time = 10 / 45 hour = (2× 60)/ 9 = 40 /30 minutes = 13 minutes 20 second
Bissoy MCQ
#গণিত #ট্রেন ও  গতিবেগ (Train & Speed) #Exim Bank Ltd #Exim Bank Ltd - Trainee Officer - 26.08.2016

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B 32.5 km and 0.50 hr
C 30 km and 0.50 hr
D 60 km and 0.25 hr
একটি মোটর গাড়ির হর্ণ দিয়ে 100 Hz কম্পাঙ্কের শব্দ উৎপন্ন করতে করতে একজন স্থির পর্যবেক্ষকের নিকট হতে একটি স্থির দেয়ালের দিকে 36 kmhr-1 বেগে চলছে। পর্যবেক্ষক প্রতি সেকেন্ডে কতগুলো স্বরকম্প গুনতে পাবে? [ বাতাসে শব্দের বেগ =332 ms-1 ]
A 3
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