6 (a) A man covers first 60 km of his journey at
30 km/hr and remaining 50 km at 20 km / hr.
Find total time taken and average speed.
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Total Time = 3 hrs
Total Distance travelled by the Man = 110 km
Distance = Speed*Time
Time= Distance/Speed
Case 1:
Distance = 60 km
Speed = 30 kmph
Time = Distance/Speed
= 60/30=1/2 hrs
Case 2:
Distance = 50 km
Speed. = 20 kmph
Time. = 50/20=52 hrs
Total Time = 5/2+1/2
= 3 hrs
Average Speed = Total Distance/Total Time
= 110/30=11/3
= 3.666
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