Question

Mr Ong makes regular business trips to Kuala lampur , a distance of 420km from Singapore. (a) On his way up to Kuala Lampur he travels along the trunk road at an average speed of x km/h. Write down an expression, in terms of x, for the time taken, in hours, to travel from Singapore to Kuala Lampur

Answer 1

: 2.mr. ong makes regular business trips to kaulalumpur a distance of 420 km from singapore (a)on his way up to kaulalumpur he travels along the trunk road at an average speed of x km/h. write down the expression in trm of x for the time taken in hours to travel from singapore to kaulalumpur
(b)on his return journey to singapore he travels along the north south highway and increases the average speed by 15 km/h.write down the expression in term of x for the time taken in the hours to travel from kaulalumpur to singapore.
(c)if the time difference between the two journey is 40 min from an equation in x and show that it reduces x^2+15x-9540=0
(d)solve the equation and find the time taken for the trip from singapore to kaulalampur