Question
‘E’ and ‘F’ are going from place ‘R’ to
place ‘S’, which is 900 km apart. If ‘E’ started 2.5 hours after ‘F’ but both of them reached ‘S’ at the same time, then find the speed of ‘F’. The difference between their speeds is 10 km/hr.Solution
ATQ, ATQ, Let the speed of ‘E’ be ‘z’ km/hr Therefore, speed of ‘F’ = (z – 10) km/hr According to the question, 
Since speed cannot be negative therefore, z = 60 Therefore, speed of ‘F’ = z - 10 = 50 km/hr
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