a) A car covers 25 kms in 10 minutes. Calculate its speed in m/s. b) If the same car given in part a) covers the same distance in same time what will be its speed in km/hr?
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Answer:
a) 25 × 1000 = 25000
Therefore, 25000 m/s
b)Let the speed of the car be s and time be t
Then, st=240⟹s=t
240
and (s+20)(t−2)=240
(
t
240
+20)(t−2)=240
(20t+240)(t−2)=240t
20t
2
+240t−480−40t=240t
20t
2
−40t−480=0
t
2
−2t−24=0
t
2
−6t+4t−24=0
(t−6)(t+4)=0
t=−4,6
Hence, time is 6 hr
and speed =
6
240
=40km/hr
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