1/3 of a certain journey is covered at the rate of 25 km/h,1/4 at the rate of 30 km/h and the rest of 50 km/h. What is the average speed for the whole journey? JNV 2017, 2009) 1 (1) 30 km/h (2) 33 km/h (3) 33.4 kr/h (4) 32 km/h
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Speeds S1, S2, and S3 are 20 km/h, 30 km/h, and 50 km/h respectively. Time taken are T1, T2, and T3 respectively. Hence, 30 km/h is the correct answer.