1. Find the unit digit of product of all odd prime numbers.Sol:We know that if we multiply by 5 to any odd prime number the result will always give unit digit 5.Hence required unit digit will be 5. Answer Video Solution on Youtube 2. Find the unit digit of 583 ×...
1. The speed of the current is 5 km/h. A boat goes 10 km upstream and back again to the starting point in 50 min. Find the speed of the boat in still water.Sol:d = 10w = 5T = 50 min = (frac{5}{6}) hourd = (frac{{{B^2} – {W^2}}}{{2B}} times T)10 = (frac{{{B^2}...
1. The speed of the current is 5 km/h. A boat goes 10 km upstream and back again to the starting point in 50 min. Find the speed of the boat in still water. View Solution 2. In a fixed time, a boy swims (frac{5}{2}) times the distance along the current that he swims...
1. A travells a distance of 180 km in 5 hr. Find his speed in m/sec ? View Solution 2. A covers 32.5 km in 5 hours. Find the distance covered by him in 8 hours. View Solution 3. A person goes from A to B at a speed of 30 km/h & returns from B to A at a speed of 10...
1. A travells a distance of 180 km in 5 hr. Find his speed in m/sec ?Sol:Speed = (frac{{180}}{5})= 36 km/h= 36 × (frac{5}{{18}})= 10 m/sec Answer Video Solution on Youtube 2. A covers 32.5 km in 5 hours. Find the distance covered by him in 8...
1. A tank has two pipes. The first pipe can fill it in 24 minutes and the second can empty it in 32 minutes. If the two pipes be opened together at a time then find the time in which tank will be filled ? View Solution 2. Pipe A can fill the tank in 5 hours and pipe B...
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