A car travelling with 5/7 of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
125/7 km/hr
25 km/hr
30 km/hr
35 km/hr

• 35 km/hr
  
  
  1 hr 40 min 48 sec. = 504/300 hr
  
  If S is speed , then
  S*5/7 = 42/(504/300)
  
  solving it, we get,
  
  S = 35 km/hr
• 13 years agoHelpfull: Yes(10) No(2)
• Time taken = 1 hr 40 min 48 sec = 1 hr 40 4 min = 1 51 hrs = 126 hrs.
  5 75 75
  Let the actual speed be x km/hr.
  
  Then, 5 x x 126 = 42
  7 75
  x = 42 x 7 x 75 = 35 km/hr.
  5 x 126
  
• 8 years agoHelpfull: Yes(0) No(1)