A car traveling with 5/7 of its actual speed covers 42 km in 1 hr 40 min 48 sec. What is the actual speed of the car?	Choose the most appropriate option:
A) 20
B) 25
C) 27
D) 30
E) 35
Time = 1 hr 40 min 48 sec = 1hr +40/60hr+48/3600hr=1+2/3+1/75=126/75hr   distance = 42 km   speed=distance/time   =42/(126/75)=42×75/126   ⇒57 of the actual speed = 42×75/126   ⇒actual speed = 42×75/126×7/5=42×15/18=7×15/3=7×5=35 km/hr   Answer is 35.
<result>E</result>
A car traveling with 5/7 of its actual speed covers 42 km in 1 hr 40 min 48 sec. What is the actual speed of the car?