A. 20 km/hr
B. 25 km/hr
C. 30 km/hr
D. 35 km/hr
Time taken = 1 hr 40 min 48 sec = 1 hr 40 (4/5) min = 1 (51/75) hrs = (126/75) hrs
Let the actual speed be X km/hr
Then, (5X/7) x (126/75) = 42
=> X = (42 x 7 x 75) / (5 x 126) = 35 km/hr
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