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if the speed of a car is increased by 20 km per hr, it takes 24 minutes less to cover a distance of 48 km. find the speed of the car. |
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Answer» ONG>Step-by-step EXPLANATION: 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−6)(t+4)=0 t=−4,6 Hence, time is 6 hr and speed = 6 240
=40km/hr |
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