<PRE><B>Question 888115</B>
 a car travels 1480 km in 13hr 24 min.
if car covers 3/5 of the journey at a speed of 148 km/hr,
find the speed of the car for the rest of the journey?
:
Change 13 hr 24 min to hrs: 13 + {{{24/60}}} = 13.4 hrs
:
Find the distance traveled at 148 km/hr
{{{3/5}}} * 1480 =  888 km
then
1480 - 888 = 592 km at an unknown speed (s)
:
Write a time equation; time = dist/speed
{{{888/148}}} + {{{592/s}}} = 13.4
6 + {{{592/s}}} = 13.4
{{{592/s}}} = 13.4 - 6
{{{592/s}}} = 7.4
s = {{{592/7.4}}}
s = 80 km/hr on the rest of the journey
:
:
You can check this out find the time at each speed, should total 13.4 hrs

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