Question
‘I’ and ‘J’ are going from place ‘V’ to
place ‘W’, which is 1350 km apart. If ‘I’ started 3 hours after ‘J’ but both of them reached ‘W’ at the same time, then find the speed of ‘J’. The difference between their speeds is 30 km/hr.Solution
ATQ, Let the speed of ‘I’ be ‘a’ km/hr Therefore, speed of ‘J’ = (a – 30) km/hr According to the question, 
Since speed cannot be negative therefore, a = 150 Therefore, speed of ‘J’ = a - 30 = 120 km/hr
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