the wheel of the engine of a train 30/7 m in circumference makes 7 revolutions in 3 sec .find the speed of the train in km/hr.    

Asked by abhi611 | 7th Jun, 2017, 11:40: AM

Expert Answer:

begin mathsize 16px style Distance space covered space in space 1 space round equals Circumference space of space the space wheel equals 30 over 7 straight m
Number space of space revolutions space in space 3 space seconds equals 7
therefore space Total space distance space covered space by space the space wheel space in space 3 space seconds equals 7 cross times 30 over 7 straight m equals 30 space straight m
therefore Speed space of space the space train equals 30 over 3 straight m divided by straight s equals 10 space straight m divided by straight s equals 10 cross times 18 over 5 space km divided by hr equals 36 space km divided by hr end style

Answered by Rashmi Khot | 7th Jun, 2017, 02:07: PM