Mr. Lee drove from City P to City Q, which are 600km apart. During his return journey, his average speed was increased by 7km/h and the time taken was 15 minutes less.
(i) 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.
(ii) Solve the equation x^2+7x-16800=0 giving both your answers correct to 2 decimal places.
(iii) Find the time taken for the return journey.
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Answer:
Answer:
speed= distance/Time
distance=600 KM, Speed=7km/h, Time=?
so Time=distance/speed
then Time=600/7
Time=8.57 hrs
Step-by-step explanation:
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