Question

A car covers 30km at a uniform speed of 60km/h and the next 30km at a uniform speed of 40km/h. find the total time taken for the journey and average speed for the journey

Answer 1

distance D1=30km
speed s1= 60km/hr
time= 30/60 = 1/2hr
distance D2=30km
speed s2=40km/hr
time t2=30/40= 3/4hr
total time =t1+t2 =1/2+3/4=5/4hr
Average speed=total distance/total time
=30+30/5/4
=48km/hr

Answer 2

distance D1=30km
speed s1= 60km/hr
time= 30/60 = 1/2hr
distance D2=30km
speed s2=40km/hr
time t2=30/40= 3/4hr
total time =t1+t2 =1/2+3/4=5/4hr
Average speed=total distance/total time
=30+30/5/4
=48km/hr

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