boy travels 50 km with 5km/hr and then for next 4hr travels with a uniform speed of
20km/hr. What The average speed of the whole journey?
(A) 62/7km/hr (B) 65/7km/hr (C) 6017km/hr (D) 9km/hr
Answers
Answered by
1
Answer:
D
Step-by-step explanation:
Average speed formula is total distance by total time taken :)
Answer came out is 9.2857
If rounded answer will be 9 km/hr
Answered by
1
Answer:
B=65/7 km/hr
Step-by-step explanation:
Average speed =total distance /total Time taken
Average speed =S1+S2/t1+t2
50+(20×4)/(50/5)+4
(Time =distance /speed)
(distance =speed×time)
50+80/10+4=130/14
130/14=65/7
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