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I am solving 6th one:
The distance which is given to us during the first part = 10 km
The speed given to us during the first part = 30kmph
Now you can find out the time taken for it by dividing distance by speed.
T1= 10/30 = 1/3 hr
Similarily T2 can be found out by divinding 40 by 50
T2= 40/50= 4/5 hr
Now what is average speed it is the ratio of total distsnce travelled to total time taken.
Putting the values=50/ 1/3+4/5
50/17/15
50*15/17 = 44.11kmph
I am attaching the solution also.
The distance which is given to us during the first part = 10 km
The speed given to us during the first part = 30kmph
Now you can find out the time taken for it by dividing distance by speed.
T1= 10/30 = 1/3 hr
Similarily T2 can be found out by divinding 40 by 50
T2= 40/50= 4/5 hr
Now what is average speed it is the ratio of total distsnce travelled to total time taken.
Putting the values=50/ 1/3+4/5
50/17/15
50*15/17 = 44.11kmph
I am attaching the solution also.
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