A person, who decided to go to weekend trip should not exceed 8 hours driving in a day. Average speed of forward journey is 60 km/h. Due to traffic in Sundays, the return journey average speed is 50 km/h. How far can he select a picnic spot?

Since he must not exceed 8 hours driving in a day:

Let the distance of the picnic be = x km.

Therefore time for forward journey = x / 60

Return journey = x / 50

The total trip should not exceed 8 hours.

Therefore: x / 60 + x / 50 < = 8. LCM = 300

Taking LCM and multiplying on both sides:

5x + 6x < = 8 (300)

11x < = 2400

x < = 2400/11

x < = 218.18

The picnic spot must be less than or equal to 218.18 km.