Question

Mr. Lee drove from City P to City Q which are 600km apart. During his return journey, Mr. Lee's average speed increased by 7km/h and the time taken was 15 minutes less. If he drove at an average speed of x km/h on his journey from City P to City Q, formulate an equation in x and show that it reduces to x^2 + 7x - 16800 = 0​

Answer 1

Answer:

x^2+7x-16800 find roots