Answer:
Odometer reading at 8:30 a.m. = 57321.0 km Odometer reading at 8:50 a.m. = 57336.0 km Distance travelled = (57336.0 − 57321.0) km = 15.0 km. Time taken = 8:50 a.m. ? 8:30 a.m. = 20 min \[\text{Speed=}\frac{\text{Distance}}{\text{Time}}\] \[=\frac{15\,\,km}{20\,\,\min }\] \[=0.75\,\,km/\min \] \[\therefore \] Speed in km/h \[=\frac{0.75\,\,km}{1/60\,h}\left( \because \,1\,\min =\frac{1}{60}h \right)\] \[=0.75\times 60\,km/h\] \[=45\,\,km/h\]
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