A train moves from P to Q at an average speed of 90km/h and immediately returns from Q to P through the same route at an average speed of 45km/h. Find the average speed for the entire journey

Similar Questions

The mean age of 12 boys involved survey is 19 years, 3 months. lf the-age of one of the boys is 22 y...

Find the probability that a number selected at random from 40 to 50 is a prime ...

Rationalize the denominator of the expression $\frac{6 + 2\sqrt{5}}{4 - 3\sqrt{6}}$...

Fifty boxes each of 50 bolts were inspected for the number which were defective. The following was t...

Evaluate \(\frac{\frac{1}{10}\times\frac{2}{3}+\frac{1}{4}}{\frac{\frac{1}{2}}{\frac{3}{5}}-\frac{1}...

If P = $\frac{2}{3}$ ($\frac{1 - r^2}{n^2}$), find n when r = $\frac{1}{3}$ and p = 1...

A cylindrical container has a base radius of 14cm and height 18cm. How many litres of liquid can it ...

Some white balls put in a basket containing twelve red balls and sixteen black balls. If the probabi...

In the diagram, $\overline{MN}$//$\overline{PQ}$, < MNP = 2x, and < NPQ = (3x - 50)°. ...

A polynomial in x whose roots are 4/3 and -3/5 is? ...