Q354
A boy rides his bicycle 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of 10 km//hr. His average speed for the entire trip is approximately:
A.
10.4 km/hr
B.
10.8 km/hr
AnswerC.
11 km/hr
D.
12.2 km/hr
Answer: Option B
Solution
Answer: Option B
Solution:
Total distance travelled := (10 + 12) km
= 22 km
Total time taken :
∴ Average speed :