Let T be the time taken and D is the distance For the case given in the problem, the distance covered is directly proportional to the time taken i.e D α T ⇒ D = ST where S is the constant speed D = 225 km and T = 4.5 hrs ∴ 225 = S x 4.5
S = 2254.5 = 50km/hr
When D = 150km
D = ST
150 = 50 × T
T = 15050 = 3 hrs
So it will take 3 hrs
