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19 January, 01:03

Raj and Dev leave the school at 3:30 PM and cycle in opposite direction. If their speeds are 5km/hr and 7km/hr respectively, at what time they will be 18 km apart?

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  1. 19 January, 01:10
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    They will be 18 km apart at 5 pm.

    Step-by-step explanation:

    Speed of Raj is 5km/hr and speed of Dev is 7km/hr

    Since they are going in opposite direction,

    So, every 1 hours there difference will be (7 + 5) km = 12 km

    Now, they will be apart 18 km distance 18/12 hours = 1 hour 30 min

    The time will be 3:30 PM + 1 hour 30 min = 5 : 00 PM
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