16 .
A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start the work together but C leaves 4 days before the completion of the work. In how many days is the work done?

A. | 15 days | B. | 14 days |

C. | 13 days | D. | 11 days |

19 .
A car covers a distance of 624 km in 6 ½ hours. Find its speed?

A. | 104 kmph | B. | 140 kmph |

C. | 104 mph | D. | 10.4 kmph |

20 .
In what time will a railway train 60 m long moving at the rate of 36 kmph pass a telegraph post on its way?

A. | 9 sec | B. | 8 sec |

C. | 7 sec | D. | 6 sec |

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