The ratio between the speeds of two cares is 7 : 8. If the 2nd car runs 200 km in 5 h, then find the speed of the 1st car.?

25 km/h
28 km/h
40 km/h
35 km/h

Correct Answer: 35 km/h

Explanation:

Let speed of the 1st car = 7k
and speed of the 2nd car = 8k
According to the question,
8k = 200/5 = 40 [ using, speed = Distance/ Time ]
∴ k = 40/8 = 5
∴ Speed of the 1st car = 7k
= 7 x 5 = 35 km/h

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