A person travels in a car for 600 km at an average speed of 50 km/h and 100 km at 100 km/h, and finally reaches his destination by travelling 50 km at a speed of 25 km/h. Determine the average speed during the whole journey.
There are 90 female members and 60 male members in a club. If the average age of female members is 35 years, and the average age of male members is 45 years, then find the average age (in years) of the whole club?
The difference between the two numbers is 15% of their sum. Find the ratio of the smaller number to the larger number.
\( \frac{13}{17} \)
\( \frac{17}{13} \)
\( \frac{17}{23} \)
\( \frac{23}{17} \)
In a proportion, the product of the 1st and 4th term is 70 and that of 2nd and 3rd term is 3.5x. The value of x is:
A and B together can do a piece of the work in 50 hours, B and C together can do the same work in 75 hours and A and C together can do the same in 25 hours. Find the time in which A, B, and C together will complete the task.