Tribeni must cover 175 km in 3.5 hours. She travels at 58 km/h for 2.5 hours, rests for 20 minutes, then completes the journey on time. What was her speed during the last stretch?

1. Distance covered first = 58 × 2.5 = 145 km, so remaining = 175 − 145 = 30 km. 2. Time used = 2.5 h + 20 min = 2 h 50 min; remaining time = 3.5 h − 2 h 50 min = 40 min = 2/3 h. 3. Speed = 30 ÷ (2/3) = 45 km/h. _Source: RRB Group D CEN-02/2018 PYQ, Q.75._