Question

a car covers 30 km at uniform speed of 60 km per hour and the next 30 km at a uniform speed of 40 km per hour find the total time

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

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Answer 2

The total time taken will be 1 hour 15 minutes

1. For first 30 km time taken will be :-
$((60 \times 30) \div 60) = 30 \: minutes$
2. For next 30 km time taken will be :-

$((40 \times 30) \div 40) = 45 \: minutes$
Hence the total time taken will be :-

$(30 + 45) \: minutes$
$= 1 \: hour \: 15 \: minutes$
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