Question

a body travels a distance of 10 km with constant speed of 30km per h and then the next 40km at a constant speed of 50km per h find the average speed.
Solve it with explanation....

Answer 1

average speed =distance covered / total time
time for Ist 10 km =distance /speed
= 10/30
=1/3 hours
Now time for next 40 km= 40/50
=4/5
So total time is 1/3 + 4/5
= (5+12)/15
=17/15 hours
Total distance is 10+40 i.e. 50 km
so average speed is 50/(17/15)
which is equal to 44.1176471 km/hr

Answer 2

Explanation:

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