Question

Rachin travels a distance at 60 km/hr for 2 hours and 80 km at 40 km/hr. Find the average speed of Rachin (in km/hr).

• A. 55
• B. 59
• C. 47
• D. 50

Answer 1

Answer:

D. 50

Average speed (=) Total distance ÷ Total time

• First part:
  Speed = 60 km/hr, Time = 2 hr
  Distance = (60 \times 2 = 120) km

• Second part:
  Distance = 80 km, Speed = 40 km/hr
  Time = (80 \div 40 = 2) hr

• Total distance = (120 + 80 = 200) km

• Total time = (2 + 2 = 4) hr

$\text{Average speed} = \frac{200}{4} = 50 \text{ km/hr}$

Average speed of Rachin = 50 km/hr