9. A journey of 650 km is covered in 12 hours. If three-fifths of the journey is covered
at a speed of 78 km/hr, at what speed is the remaining journey completed?
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Step-by-step explanation:
distance covered with speed of 78 km/hr=3/5*650
=390km
time taken to cover the journey of 390 km
=390/78
=5 hr
therefore time left=12-5=7 hr
distance left=650-390=260 km
speed with which the journey is completed
=260/7
=37.14 km/hr
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