Marili walks 10 km to a waterfall at an average speed of x Km per hour.

a) Write down,in terms of x,the time taken in hours.
b) Marili returns from the waterfall but this time she walks the 10 km at an average speed of (x+1) km per hour. The time of the return journey is 30 mins less than the time of the first journey. Write down an equation in x and show that it simplifies to x^2+x-20=0.
c) Solve the equation x^2+x-20=0
d) Find the time Marili takes to walk TO the waterfall.

Question

Marili walks 10 km to a waterfall at an average speed of x Km per hour.

a) Write down,in terms of x,the time taken in hours.
b) Marili returns from the waterfall but this time she walks the 10 km at an average speed of (x+1) km per hour. The time of the return journey is 30 mins less than the time of the first journey. Write down an equation in x and show that it simplifies to x^2+x-20=0.
c) Solve the equation x^2+x-20=0
d) Find the time Marili takes to walk TO the waterfall.