Aroute up a mountain is 20 km long john followed this routeat the average speed of x km/h a)write down an expression in trems of x for a number of hours he tooks to walk up the mountain b)he came down the mountain by a different route the lenght ofthis route was 25 km his average speed coming down the mountain was2 m per hour greater then his average speed going up the mountainwrite down an expression in terms of x for the number of hours hetook to walk down c)if took john one and half hours less to come downthen to go up write down an equation in x and show that itsimplifies to 3x^2+16x-80-0