Explanation

The fourth generation of computers is marked by the use of Very Large Scale Integrated (VLSI) circuits.

VLSI starts in 1970

Explanation

Speed of train relative to jogger = (45−9) km/hr = 36 km/hr

=(36×185​)m/sec

= 10 m/sec.

Distance to be covered = (240+120)m=360m.

∴ Time taken =(10360​)sec

=36sec.

Explanation

C is a general-purpose computer programming language.

It was created in the 1970s by Dennis Ritchie and remains.

Explanation

Origin lies on the intersection of the x-axis and y-axis, i.e. (0,0).

Explanation

Speed of the two trains: 60 km/hr and 90 km/hr

If train cross each other, then effective speed = 60 + 90 = 150 km/hr

Length of first train = 1.10 km or 1100 m

Length of second train = 0.9 km or = 900 m

formula

Speed = Distance/Time

⇒ 150 × (5/18) = 2000/Time

⇒ 125/3 = 2000/Time

⇒ Time = 2000 × (3/125)

∴ Time = 48 seconds.

Relative speed = 60 + 90 = 150 km/hr. = 150 x 5/18 = 125/3 m/sec. Distance covered = 1.10 + 0.9 = 2 km = 2000 m. Required time = 2000 x 3/125 = 48 sec.