A person cover a distance of 450 km partly by train and partly by car If he travels 100 km by train rest by car it-takes 8 hours and if he covers 170 by train and rest by car it takes him 8 hours 12 minute to cover that distance. Find the speed of train.
(a) 28km/hr
(b) 45 km/hr
(c) 50 km/hr
(d) 45.5km/hr
Sol:
⇒ 400(t) + 1400(c) = 32 …(i)
850(t) + 1400(c) = 43 …(ii)
Subtracting (i) from (ii)
= 450(t) = 9 hours
⇒ 450 km by train in 9 hours
In 1 hour = 50 km.