Subject: General Aptitude · Chapter: Time and Distance · Exam: 2011 · Marks: · Difficulty:
Two boys A and B start at the same time to ride from Delhi to Meerut, 60 km away. A travels 4 km an hour slower than B. B reaches Meerut and at once turns back meeting A 12, km from Meerut. Find A’s speed.
Answer
Answer (as printed):
Explanation
Let A’s speed = x km/hr. Then, B’s speed = (x + 4) km/hr. Clearly, time taken by B to cover (60 + 12), i.e., 72 km = time taken by A to cover (60 – 12) i.e., 48 km 72 48 \ = ⇔ 72 x = 48 x + 192 ⇔ 24 x = 192 ⇔ x = 8. x+4 x Hence, A’s speed = 8 km/hr.
Explanation as extracted from the printed page; notation may be imperfect.