Wang Qiang took part in a 3000 meter race. He ran a part of the distance at the speed of 6 meters per second and finished the rest at the speed of 4 meters per second. It took 10 minutes. How many meters did Wang Qiang run at the speed of 6 meters per second?

Wang Qiang took part in a 3000 meter race. He ran a part of the distance at the speed of 6 meters per second and finished the rest at the speed of 4 meters per second. It took 10 minutes. How many meters did Wang Qiang run at the speed of 6 meters per second?

Solution 1: let Wang Qiang run x meters at the speed of 6 meters per second, then he runs (3000-x) meters at the speed of 4 meters per second. According to the equation: X6 + 3000 − X4 = 10 × 60, remove the denominator to get: 2x + 3 (3000-x) = 10 × 60 × 12. Remove the brackets to get: 2x + 9000-3x = 7200. Remove the term to get: 2x-3x = 7200-9000. Merge the same terms to get: - x = - 1800. Change the coefficient to 1 to get: x = 1800. Solution 2: let Wang Qiang run at the speed of 6 meters per second According to the equation 6x + 4 (10 × 60-x) = 3000, remove the brackets and get: 6x + 2400-4x = 3000. Transfer the items and get: 6x-4x = 3000-2400. Merge the similar items and get: 2x = 600. Change the coefficient to 1 and get: x = 300, 6x = 6 × 300 = 1800. Answer: Wang Qiang ran 1800 meters at the speed of 6 meters / second