Important for :

1

B

Distance covered by Shaan in 3 hours = 3 × 50 = 150 km

∴ They meet after = |
560 | = 7 hours |

80 |

Now, Shaan covers the total distance in (7 + 3 )= 10 hours

Hence, option B is correct.

2

B

Total distance = 370 kmNow, the distance covered by first car in (10 am to 1 pm =) 3 hours = 80 × 3 = 240 km

Remaining distance = 370 – 240 = 130 km

Relative speed = 80 + 50 = 130 kmph

Now, they cover 130 km in | ( | 130 | = | ) | 1 | hours = 60 mins |

130 | 1 |

Hence, option B is correct.

3

4

5

B

Distance covered in first two hours = 70 × 2 = 140 kmDistance covered in next two hours = 80 × 2 = 160 km

Distance covered in first four hours = 140 + 160 = 300 km

Remaining distance = 345 – 300 = 45 km

Now, this distance will be covered at the rate of 90 km/hr.

∴ time taken = |
45 | = | 1 | hour |

90 | 2 |

Total time = 4 + | 1 | = 4 | 1 | hours |

2 | 2 |

Hence, option B is correct.