The ratio of the speeds of two trains is 2 : 7. If the first train runs 250 km in 5 hours, then the sum of the speeds (in km/h) of both the trains is:
Answer & explanation
Correct answer: option 4
Ratio of speed of !st and 2nd train = 2 : 7
Speed of 1st train = \(\frac{250}{5}\) = 50 km/h
According to question ,
2R = 50
1R = 25
Now , Sum to speed of both the trains = 2R + 7R = 9R
9R = 9 × 25 = 225 km/h