Question
A woman drove for 5 hours at a constant speed of 60 km/h
and then drove another 2 hours at a constant speed of 90 km/h. Find her average speed for the whole journey.Solution
ATQ,
Total distance travelled by the woman = 60 × 5 + 90 × 2 = 300 + 180 = 480 km
Total time taken = 5 + 2 = 7 hours
So, average speed = total distance travelled ÷ total time taken = 480 ÷ 7 = 68.57 km/h
The ratio of the present ages of A and B is 10:7. After 8 years, the ratio of their ages will be 12:9. Find the ratio of their ages 12 years ago.
The total number of cars to the total number of bikes in Showrooms P and Q is in the ratio 60:17. Additionally, the number of bikes in Showroom P to th...The ratio of milk to water in a mixture is 5:3. If 16 liters of water is added, the ratio becomes 5:7. Find the initial quantity of milk in the mixture.
The ratio of A's income to savings is 25:9, and B's expenditure is 60% of A's total income. If B's expenditure exceeds its savings by Rs. 3500, and A's ...
4%of the selling price of an article is equal to 5% of its cost price. Again 20% of the selling price is Rs.120 more than 22%ofits cost price. The ratio...
Ratio of P's age, 5 years hence and Q's age, 3 years ago was 15:17 respectively. 7 years ago, if the average age of 'P' and 'Q' was 40 years, then find ...
A plot has to be divided among P, Q and R in the ratio 3:4:6 respectively. If the area of plot received by R is 4800m ² more than the area of plot ...
- A piggy bank holds 20-paise, 50-paise and 2-rupee coins in the ratio 15:12:9. The total amount inside is Rs. 3006. How many 50-paise coins are there?
6 liters of milk are removed from a can full of milk and replaced with water. This process is repeated three more times. The ratio of the remaining milk...
The ratio of the number of females to that of male employees in a small company is 2: 3. If the number of male employees in the company is 90, then the ...
