Answer:

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Step-by-step explanation:

See the attachment

Verified answer

Given:

Let 1st friend be 'A' and 2nd friend be 'B'

'A' is running at a speed 4km/hr

'B' is running at a speed 4m/s = 14.4km/hr

To find:

Distance between A and B after 30 mins or 0.5hr

Solution:

Relation between speed, distance and time is;

              Distance = Speed x Time

Distance travelled by A in 0.5hr

      = (4km/hr) x 0.5hr

      = 2km

Distance travelled by B in 0.5hr

       = (14.4km/hr) x 0.5hr

       = 7.2km

The distance between A and B after 0.5hr

       = 2km + 7.2km

       = 9.2km

The distance between the two friends running in opposite direction after 30min is 9.2km