সময়,দূরত্ব ও গতিবেগ
1. While going to office, Ramesh travels at a speed of 30 kmph and on his way back, he travels at a speed of 45 kmph. What is his average speed of the whole journey?
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উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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One card is drawn from a pack of 52 cards. What is the probability that the card drawn is either a red card or a King?
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Two pipes A and B can fill a cistern in 12 minutes and 15 minutes respectively while a third pipes C can empty the full cistern in 6 minutes. A and B are kept open for 5 minutes in the beginning and then C is also opened. In what time is the cistern emptied?
