A and B walk around a cricular track. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. If they start at 8 a.m from the same point in opposite directions, how many times shall they cross each other before 9.30 a.m.
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Answer:
Relative speed = Speed of A + Speed of B (∴ they walk in opposite directions)
=
2
+
3
=
5
rounds per hour
Therefore, they cross each other
5
times in
1
hour and
2
times in
1
2
hour
Time duration from
8
a.m. to
9.30
a.m.
=
1.5
hour
Hence they cross each other
7
times before
9.30
a.m.
Step-by-step explanation:
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