question_answer

The odometer of a car reads 57,321 km when the clock shows time 8:30 a.m. What is the distance moved by the car, if at 8:50 a.m., the Odometer reading has changed to 51,336 km? Calculate speed of car in km/min during this time. Express the speed in km/h also.

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 \[=\frac{0.75\,\,km}{1/60\,h}\left( \because \,1\,\min =\frac{1}{60}h \right)\]                         \[=0.75\times 60\,km/h\]                         \[=45\,\,km/h\]