Question

Speed of a train is 20km/hr . The strength of the steam was increased two-fold but due to
certain other factors, the friction also increased 1 ½ times. If in the beginning the ratio of the strength of steam and friction was 3:1 . Find the present speed of the train.
(a)40km/hr
(b)30km/hr
(c)45 km/hr
(d)None of these; Speed of a train is 20km/hr . The strength of the steam was increased two-fold but due to; certain other factors, the friction also increased 1 ½ times. If in the beginning the ratio of the strength of steam and friction was 3:1 . Find the present speed of the train.; (a)40km/hr; (b)30km/hr; (c)45 km/hr; (d)None of these

Answer 1

I think answer is

B) 30km/hr