Explanation

Let the speed of the slower friend be $x$ km/h, then the speed of the faster friend is$x+2$ km/h.

After 1 hour, their total distance apart is the sum of their speeds:

$$x+(x+2)=10$$

Simplifying:

2x+2=10

$$2x=8\Rightarrow$$x=4km/h

So, the slower friend's speed is 4 km/h, and the faster friend's speed is $4 + 2 = 6$ km/h.

Explanation

Explanation

Explanation

Explanation

It's measured by Young's modulus (modulus of elasticity) — the higher the Young's modulus, the stiffer and more elastic (in the sense of resisting deformation) the material.

• Copper: ~110–130 GPa
• Silver: ~80–83 GPa
• Iron: ~190–210 GPa
• Quartz (fused silica): ~70–75 GPa

Last updated 24-07-2026 by NA

Explanation

We are given:

x+y=10

xy=20

The sum of the reciprocals of the two numbers is: 1/x+1/y =x+y/xy

Substitute the given values:

=10/20

=1/2

Explanation

 Trojan Horse is malware that is installed on a computer without the user's knowledge and often runs malicious code.

Explanation

The correct punctuation is "History, it has been said, is the essence of innumerable biographies."

Commas are needed to set off the clause "it has been said."

Explanation

In most sports, the referee signs the final result after the game to confirm the official score or outcome.

Explanation

In passive voice, "She will have sung a song" becomes "A song will have been sung by her."

Passive voice changes the focus from the subject to the object.