Subject: General Aptitude · Chapter: Time and Distance · Exam: · Marks: · Difficulty:
Sound waves travel at 300 m/s. Sound produced at a point is heard by a person after 5 seconds while the same sound is heard by another person after 6 seconds. What could be the maximum and minimum distance between the two persons?
(a)1.8 km, 0.15 km
(b)2.2 km, 0.20 km
(c)2.8 km, 0.25 km
(d)3.3 km, 0.3 km
Answer
Answer (as printed): D
Explanation
Clearly, the two persons would be maximum distance apart when they stand in opposite directions to the point at which sound is produced, and minimum distance apart when they stand in the same direction. ∴ Maximum distance between the two persons = Distance covered by sound in (6+5) seconds, i.e. 11 sec $=(300 \times 11) \mathrm{m}=3300 \mathrm{m}=3.3 \mathrm{km}$. And, minimum distance between the two persons = Distance covered by sound in (6-5) sec., i.e. 1 sec $=300 \mathrm{m}=0.3 \mathrm{km}$.