A car driver covers the first 100 k.m. at the speed of 50 km/ hr and other 120 at the speed of 40 km/ hr, if he moves with his average speed by which he travelled 220 k.m., then the time required for further travelling of 242 km is...
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The concept being tested is :
1.) Calculating average speed
2.) Calculating time given speed and distance.
Formulas :
Average speed = Total distance ÷ total time
Time = Distance ÷ Speed
At the speed of 50 km/h and distance of 100km :
Time = 100 / 50 = 2hrs
At a speed of 40 km/h and distance 120km :
Time = 120 / 40 = 3hrs
Total time = 2 + 3 = 5hrs
Total distance covered = 100 + 120 = 220km
Average speed = 220 / 5= 44 km/ h
Time taken to cover 242 km at an average speed of 44km/h :
242 / 44 = 5. 5 hrs
5.5 hrs
1.) Calculating average speed
2.) Calculating time given speed and distance.
Formulas :
Average speed = Total distance ÷ total time
Time = Distance ÷ Speed
At the speed of 50 km/h and distance of 100km :
Time = 100 / 50 = 2hrs
At a speed of 40 km/h and distance 120km :
Time = 120 / 40 = 3hrs
Total time = 2 + 3 = 5hrs
Total distance covered = 100 + 120 = 220km
Average speed = 220 / 5= 44 km/ h
Time taken to cover 242 km at an average speed of 44km/h :
242 / 44 = 5. 5 hrs
5.5 hrs
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