The speeds of two cars are in the ratio \(5 : 7\). The faster car covers 140 km in 2 hours. How much distance will the slower car cover in the same time?
100 km
The speeds are in the ratio \(5 : 7\), so the faster car corresponds to 7 parts and the slower car to 5 parts.
For the same time, distance is proportional to speed, so the distances are also in the ratio \(5 : 7\).
The faster car (7 parts) covers 140 km, so one part \(= \frac{140}{7} = 20\) km.
The slower car covers 5 parts \(= 5 \times 20 = 100\) km.
Hence, the slower car covers 100 km in the same time.
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The average age of 3 persons is 30 years.If their ages are in the ratio of 3 : 5 : 7 respectively, then the age of the eldest person is:
The income of A and B are in the ratio 5 : 3. The expenses of A, B and C are in the ratio of 8 : 5 : 2. If C spends 2000 and B saves ₹ 700, then A saves:
