Question

6.
A goes 10km distance with average speed of 6km/h while rest 20km he travels with an
average speed of 15 km/h. Then the average speed of 'A' during the whole journey =
1) 10km/h 2) 12km/h
3) 13 km/h
4) 14.5km/h​

Answer 1

Answer:

distanceS1=10km,speed  v1=6km/hr

time taken T1=v1S=610=1.67hr

distanceS2=20km,speed  v2=15km/hr

time taken T2=v2S=1520=1.33hr

total time taken T=T1+T2=1.67+1.33=3hr

average speed=total time taken/total distance travelled=330

=10km/hr