Question

1. A man covers first 120 km of his
journey at 40 km/h, next 145 km
at 58 km/h and last 35 km at half
an hour. Find his average speed
during the whole journey. (June 2011]​

Answer 1

Answer:

50km/h

Step-by-step explanation:

for first 120km, t=120/40=3 hrs

next 145km, t=145/58=2.5hrs

last 35km ,t=1/2 hrs given

total distance covered =120+145+35=300km

total time=3+2.5+0.5=6hrs

avg speed= total distance/total time =300/6=50km/h