question_answer

Three friends Thomas, Harry and James went for the marathon and start their run at 6 A.M. and run through planes and hills on their way and return at 12 P.M. If their speed on the plane ground is 4 km/h, up the hill it is 3 km/h and down the hill it is 6 km/h. Find the total distance they cover during the whole journey.

A)  15km

B)  10km       

C)  12km

D)  18km

E)  None of these