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Given : During a trekking activity of 6km a student Ram will go to Sangam and return back up to 12 noon.
To find : latest time by which Ram should begin his walk
Solution:
a trekking activity of 6km
=> total Distance = 6 km
One way Distance = 6/2 = 3 km
Going speed = 1.5 km/hr
Return speed = 1.5/2 km /hr
Time taken in going = 3/1.5 = 2 hr
Time taken in return = 3/(1.5/2) = 4 hr
Total Time Taken = 6 hr
To return by 12 Noon
he has to leave by 12 - 6 = 6 AM
latest by 6 AM Ram can begin his walk so that he can return by 12 noon