a boat travel for 4hr from pole a to pole b.then it travel for 3hr from pole b back to pole a.the distance between the two poles was 40km
a.find the total time taken for the whole journey
b.find the average speed for the whole journey
total time = 4 hours + 3 hours = 7 hours.
Avg speed = total distance / total time
Avg speed = 40 * 2 / 7 = 80/7 km/h
1.5
To find the total time taken for the whole journey, we need to add the time taken to travel from pole A to pole B and the time taken to travel from pole B back to pole A.
a) Time taken from pole A to pole B: 4 hours
b) Time taken from pole B to pole A: 3 hours
To get the total time taken, we add the two times together:
Total time taken = Time from A to B + Time from B to A
= 4 hours + 3 hours
= 7 hours
Therefore, the total time taken for the whole journey is 7 hours.
To find the average speed for the whole journey, we use the formula:
Average speed = Total distance / Total time
a) Total distance between pole A and pole B: 40 km
b) Total time taken for the whole journey: 7 hours (as calculated earlier)
To get the average speed, we divide the total distance by the total time:
Average speed = 40 km / 7 hours
= 5.71 km/h (rounded to two decimal places)
Therefore, the average speed for the whole journey is approximately 5.71 km/h.