Question

a car travels 30 kn at a uniforn speed of 40km/hr and next 30km at a uniform speed of 20km/hr.Calculate its average

Answer 1

Hi.■●■●

Here is your answer.●■●■

Given-----
Initial speed (u) = 40 km/hr.
Initial distance (d1) = 30 km.
Thus, time(t1) = d1/S
= 30/40
= 3/4 hr.

Final speed (v) = 20km/hr.
Final distance (d2) =30km.
Time (t2) = 30/20
= 3/2
Total time (T) = t1 +t2
= 3/4 + 3/2
= (3 + 6)/4
= 9/4
Total distance (d) = d1 + d2
= 30 + 30
= 60 km.
Average speed = Total distance/time
= d/T
= 60/(9/4)
= 80/3 km/hr.
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Hope it will help u.■■■

Have a nice day.●●●

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