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08 Mar 2026, 04:35
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
73% (02:04) correct
27%
(02:19)
wrong
based on 111
sessions
History
Date
Time
Result
Not Attempted Yet
A communications satellite travels at a constant speed of 1.8 × 10^4 kilometers per hour. Approximately how many seconds does it take to travel 28.8 kilometers?
A. 0.3
B. 0.6
C. 1.08
D. 3
E. 6
A. 0.3
B. 0.6
C. 1.08
D. 3
E. 6
08 Mar 2026, 05:48
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Speed= 1.8*10^4= 18000 Km/h
Distance= 28.8 Km
N.o of seconds to travel 28.8Km= (28.8/18000) * 3600= ~ 6 (E)
Distance= 28.8 Km
N.o of seconds to travel 28.8Km= (28.8/18000) * 3600= ~ 6 (E)
08 Mar 2026, 11:41
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Key concept: Unit Conversion inside a Rate Problem
This looks like a simple distance = rate × time problem, and it is — but the GMAT hides the trap right in the units. The question gives speed in km/hr and asks for time in seconds. Most students who get this wrong either skip the hours-to-seconds conversion entirely (and pick D) or convert to minutes instead of seconds (and get a number that's close to nothing on the answer list).
Here's how to work it cleanly:
Step 1 — Set up the time formula:
Time = Distance ÷ Speed
Time = 28.8 ÷ (1.8 × 10^4) hours
Step 2 — Handle the division:
28.8 ÷ 1.8 = 16
So Time = 16 ÷ 10^4 = 0.0016 hours
Step 3 — Convert hours to seconds:
1 hour = 60 min × 60 sec = 3,600 seconds
Time = 0.0016 × 3,600
= 1.6 × 3.6 = 5.76 seconds
Step 4 — Apply "approximately":
5.76 ≈ 6 → Answer: E
Common trap: Students who pick D (3) usually multiplied by 60 once, stopping at minutes. Students who pick C (1.08) made an arithmetic slip in the 1.6 × 3.6 step. The word "approximately" in the question stem is your signal that some rounding is expected — don't second-guess yourself if your answer isn't exact.
Takeaway: Whenever speed is in km/hr but the question asks for seconds, convert your time result from hours → seconds in one clean multiplication by 3,600 at the very end.
— Kavya | 725 (99th percentile), GMAT Focus Edition
This looks like a simple distance = rate × time problem, and it is — but the GMAT hides the trap right in the units. The question gives speed in km/hr and asks for time in seconds. Most students who get this wrong either skip the hours-to-seconds conversion entirely (and pick D) or convert to minutes instead of seconds (and get a number that's close to nothing on the answer list).
Here's how to work it cleanly:
Step 1 — Set up the time formula:
Time = Distance ÷ Speed
Time = 28.8 ÷ (1.8 × 10^4) hours
Step 2 — Handle the division:
28.8 ÷ 1.8 = 16
So Time = 16 ÷ 10^4 = 0.0016 hours
Step 3 — Convert hours to seconds:
1 hour = 60 min × 60 sec = 3,600 seconds
Time = 0.0016 × 3,600
= 1.6 × 3.6 = 5.76 seconds
Step 4 — Apply "approximately":
5.76 ≈ 6 → Answer: E
Common trap: Students who pick D (3) usually multiplied by 60 once, stopping at minutes. Students who pick C (1.08) made an arithmetic slip in the 1.6 × 3.6 step. The word "approximately" in the question stem is your signal that some rounding is expected — don't second-guess yourself if your answer isn't exact.
Takeaway: Whenever speed is in km/hr but the question asks for seconds, convert your time result from hours → seconds in one clean multiplication by 3,600 at the very end.
— Kavya | 725 (99th percentile), GMAT Focus Edition
