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A travels 40 km at 8km/hrajan_agarwal wrote:Q. A travels 40 km at 8km/h and another 40km in 5hrs what is the average speed?
Brent@GMATPrepNow wrote:A travels 40 km at 8km/hrajan_agarwal wrote:Q. A travels 40 km at 8km/h and another 40km in 5hrs what is the average speed?
Distance = 40 km
Time = distance/speed = 40/8 = 5 hrs
A travel another 40km in 5hrs
Distance = 40 km
Time = distance/speed = 40/5 = 8 hrs
Average speed = (TOTAL distance)/(TOTAL time)
= (40 km + 40 km)/(5 hrs + 8 hrs)
= [spoiler]80/13 km/hr[/spoiler]
Good catch!Amrabdelnaby wrote:Hello Brent,
The second part of the question says another 40 km for 5 hours. 5 hours was the time not the speed; hence it yields to 8 kn per hour again. hence the average speed should be 8km/hr.
Right?
Brent@GMATPrepNow wrote:A travels 40 km at 8km/hrajan_agarwal wrote:Q. A travels 40 km at 8km/h and another 40km in 5hrs what is the average speed?
Distance = 40 km
Time = distance/speed = 40/8 = 5 hrs
A travel another 40km in 5hrs
Distance = 40 km
Time = distance/speed = 40/5 = 8 hrs
Average speed = (TOTAL distance)/(TOTAL time)
= (40 km + 40 km)/(5 hrs + 8 hrs)
= [spoiler]80/13 km/hr[/spoiler]
