Let the speed of a car for the first part of the journey is v1. Then time of motion for the first part of the journey
t1=v1120For the second part we get
t1−31hr=v1+5120 Hence
v1120−31=v1+5120
v1120−v1+5120=31 Root
v1=40km/hrThus
t1=40120=3hr
t2=t1−1/3=3−1/3=2hr40minTotal time of motion
t=t1+t2=5hr40minAnswers:
(a) 40km/hr
(b) 5hr40min
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Thanks :)
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