A and B started travelling towards each other at the same time, from place X to Y and Y to X, respectively. After crossing each other. A and B took 2.45 hours and 4.05 hours to reach Y and X, respectively. If the speed of B was 8.4 km/h, then what was the speed (in km/h) of A?
Show answer & explanation
Correct answer: A
Explanation
Correct Answer is option 1 i.e. 10.8
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Understanding |
Application |
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After crossing each other. A and B took 2.45 hours and 4.05 hours to reach Y and X, respectively. |
So, Speed of A/Speed of B = √(4.05/2.45)
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Given: Speed of B was 8.4 km/h Suppose speed of A = x km/hr |
So, [x/8.4] = √(4.05/2.45) [x/8.4] = √(81/49) [x/8.4] = 9/7 x = 10.8 Hence, Speed of A = 10.8 km/hr |