The ratio between the speed of two trains is 3 : 4. If the second train covers 2 km in 50 seconds, the speed of first train is.
Answer & explanation
Correct answer: option 1
Speed = \(\frac{Distance}{Time}\)
Speed of 2nd train = \(\frac{2000}{50}\) m/sec = 40 m/sec .....(i)
Ratio of speed = 1st : 2nd = 3 : 4
4R = 40 m/sec [from (i)]
1R = 10 m/sec
Speed of 1st train = 3R =3 × 10 = 30 m/sec