2016年10月8日 · Dara drove from home to the airport to pick up her friend and then came back home on the same route. Her average speed on the way to the airport was 55 miles per hour …

2013年10月31日 · Subtract 1 from x-coordinates. Switch sign of x-coordinates. Add 1 to x-coordinates. You can do all this with the matrix operations: …

2015年5月29日 · Given the sequence 123456789: You can insert three operations ($+$,$-$,$\\times$,$/$) into this sequence to make the equation = 100. My question is: is there a way …

2021年12月16日 · The frog progresses $3-2=1$ foot every day that it does not make it out. It makes it out once it jumps from $27$ feet. So it will take $28$ days. Alternatively; the frog …

Light both ends: 50 minutes in and finally it’s done. Left side burnt only Unit 1 and right side burnt units 5, 4, 3, 2. Or after 30 minutes, unit 1 is not burnt, and only unit 5 and 4 are burnt. The …

2018年7月23日 · This is a nice picture, using an equilateral triangle, because the shape has both 2-way and 3-way symmetry. Each large right triangle is 1/2, and each kite is 1/3. Is this the …

Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …

2019年6月4日 · I have been given problem of a road network as shown in picture. It shows a network of one-way streets with traffic flowing in the directions indicated. The flow rates along …

2015年12月18日 · In a game players take turns saying up to 3 numbers (starting at 1 and working their way up) and who every says 21 is eliminated. So we may have a situation like the …

2021年9月9日 · They turn around and paddle downstream for 4 hours. The next morning, they pack up and get back on the river to canoe to their original starting point 28 miles upstream …